diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9c90d9d..83b1768 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,9 +7,6 @@ on:
   pull_request:
     types: [opened, synchronize, reopened]
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: true
 
 jobs:
   build:
@@ -29,7 +26,7 @@ jobs:
       uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
     - name: Install dependencies
-      run: python -m pip install -U "jupyterlab>=4.0.0,<5" ebrains-drive pytest pytest-mock "pytest-jupyter[server]>=0.6.0" pytest_tornasync pytest-cov
+      run: python -m pip install -U "jupyterlab>=4.0.0,<5" ebrains-drive pytest pytest-mock "pytest-jupyter[server]>=0.6.0" pytest_tornasync build
 
     - name: Lint the extension
       run: |
@@ -37,7 +34,7 @@ jobs:
         jlpm
         jlpm run lint:check
 
-    - name: Test the extension
+    - name: Test the extension with jlpm
       run: |
         set -eux
         jlpm run test
@@ -47,13 +44,15 @@ jobs:
         set -eux
         python -m pip install .[test]
 
-        pytest -vv -r ap --cov --cov-report=xml tvb_ext_bucket
-        jupyter server extension list
         jupyter server extension list 2>&1 | grep -ie "tvb_ext_bucket.*OK"
-
-        jupyter labextension list
         jupyter labextension list 2>&1 | grep -ie "tvb-ext-bucket.*OK"
         python -m jupyterlab.browser_check
+        
+    - name: Run Python & JS tests
+      run: |
+        set -eux
+        pytest tvb_ext_bucket -r ap
+        yarn test
 
     - name: Package the extension
       run: |
@@ -63,12 +62,6 @@ jobs:
         python -m build
         pip uninstall -y "tvb-ext-bucket" jupyterlab
 
-    - name: SonarCloud Scan
-      uses: sonarsource/sonarcloud-github-action@v2
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-
     - name: Upload extension packages
       uses: actions/upload-artifact@v4
       with:
@@ -76,6 +69,31 @@ jobs:
         path: dist/tvb_ext_bucket*
         if-no-files-found: error
 
+  sonar_cloud:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Base Setup
+        uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+
+      - name: Install dependencies
+        run: python -m pip install -U "jupyterlab>=4.0.0,<5" ebrains-drive pytest pytest-mock "pytest-jupyter[server]>=0.6.0" pytest_tornasync pytest-cov
+
+      - name: Compute coverage
+        run: |
+          python -m pip install .[test]
+          pytest -vv -r ap --cov --cov-report=xml tvb_ext_bucket
+          yarn test --coverage
+
+      - name: SonarCloud Scan
+        uses: sonarsource/sonarcloud-github-action@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+
   test_isolated:
     needs: build
     runs-on: ubuntu-latest
@@ -99,10 +117,7 @@ jobs:
         pip install "jupyterlab>=4.0.0,<5" tvb_ext_bucket*.whl
 
 
-        jupyter server extension list
         jupyter server extension list 2>&1 | grep -ie "tvb_ext_bucket.*OK"
-
-        jupyter labextension list
         jupyter labextension list 2>&1 | grep -ie "tvb-ext-bucket.*OK"
         python -m jupyterlab.browser_check --no-browser-test
 
diff --git a/README.md b/README.md
index ab55e5e..241ff18 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ pip install -e ".[test]"
 # Link your development version of the extension with JupyterLab
 jupyter labextension develop . --overwrite
 # Server extension must be manually installed in develop mode
-jupyter server extension enable tvb_ext_bucket
+jupyter server extension enable tvbextbucket
 # Rebuild extension Typescript source after making changes
 jlpm build
 ```
diff --git a/src/DropZone.tsx b/src/DropZone.tsx
index f7f5b0e..d765836 100644
--- a/src/DropZone.tsx
+++ b/src/DropZone.tsx
@@ -5,7 +5,7 @@ import React, {
   useCallback,
   useMemo
 } from 'react';
-import { Drag, IDragEvent } from '@lumino/dragdrop'; // must use the deprecated interface
+import { Drag } from '@lumino/dragdrop';
 import { useBucketContext } from './BucketContext';
 import { JpFileBrowser } from './JpFileBrowser';
 import { MimeData } from '@lumino/coreutils';
@@ -62,10 +62,9 @@ export const DropZone: React.FC<DropZone.IProps> = ({
     let isValidDragSource = false;
 
     let item = possibleTargets?.next();
-    while (item) {
-      const currentItem = item.value;
-      items.push(currentItem);
-      if (currentItem.name === dragSourceElement?.innerText) {
+    while (item.value) {
+      items.push(item.value);
+      if (item.value.name === dragSourceElement?.innerText) {
         isValidDragSource = true;
       }
       item = possibleTargets?.next();
@@ -100,43 +99,43 @@ export const DropZone: React.FC<DropZone.IProps> = ({
         console.log('handling: ', ev.type);
         switch (ev.type) {
           case 'lm-dragenter':
-            handler._dragEnter(ev as IDragEvent);
+            handler._dragEnter(ev as Drag.Event);
             break;
           case 'lm-dragover':
-            handler._dragOver(ev as IDragEvent);
+            handler._dragOver(ev as Drag.Event);
             break;
           case 'lm-drop':
             handler
-              ._drop(ev as IDragEvent)
+              ._drop(ev as Drag.Event)
               .then(() => console.log('drop handled'));
             break;
           case 'lm-dragleave':
-            handler._dragLeave(ev as IDragEvent);
+            handler._dragLeave(ev as Drag.Event);
             break;
         }
       },
-      _dragEnter: (ev: IDragEvent): void => {
+      _dragEnter: (ev: Drag.Event): void => {
         ev.preventDefault();
         ev.stopPropagation();
         setMode('hover');
-        Drag.overrideCursor('pointer');
       },
-      _dragOver: (ev: IDragEvent): void => {
+      _dragOver: (ev: Drag.Event): void => {
         ev.preventDefault();
         ev.stopPropagation();
         ev.dropAction = ev.proposedAction; // needed to trigger lm-drop
-        Drag.overrideCursor('pointer');
         setMode('hover');
       },
-      _dragLeave: (ev: IDragEvent): void => {
+      _dragLeave: (ev: Drag.Event): void => {
         ev.preventDefault();
         ev.stopPropagation();
-        Drag.overrideCursor('auto');
         setMode('default');
       },
-      _drop: async (ev: IDragEvent): Promise<void> => {
+      _drop: async (ev: Drag.Event): Promise<void> => {
         ev.preventDefault();
         ev.stopPropagation();
+        if (!ev.source) {
+          return;
+        }
         if (uploadingRef.current) {
           await showErrorMessage(
             notAllowedUpload.title,
@@ -154,7 +153,6 @@ export const DropZone: React.FC<DropZone.IProps> = ({
           );
         }
 
-        Drag.overrideCursor('auto');
         setMode('default');
         setUploading(false);
       }
diff --git a/src/index.ts b/src/index.ts
index 9b14e2d..fa119f9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -5,7 +5,10 @@ import {
   JupyterFrontEndPlugin
 } from '@jupyterlab/application';
 
-import { IFileBrowserFactory } from '@jupyterlab/filebrowser';
+import {
+  IFileBrowserFactory,
+  IDefaultFileBrowser
+} from '@jupyterlab/filebrowser';
 
 import { ICommandPalette, WidgetTracker } from '@jupyterlab/apputils';
 
@@ -27,7 +30,8 @@ const plugin: JupyterFrontEndPlugin<void> = {
     ILayoutRestorer,
     IConsoleTracker,
     ILabShell,
-    IFileBrowserFactory
+    IFileBrowserFactory,
+    IDefaultFileBrowser
   ],
   activate: (
     app: JupyterFrontEnd,
@@ -35,12 +39,13 @@ const plugin: JupyterFrontEndPlugin<void> = {
     restorer: ILayoutRestorer,
     consoleTracker: IConsoleTracker,
     labShell: ILabShell,
-    fileBrowserFactory: IFileBrowserFactory
+    fileBrowserFactory: IFileBrowserFactory,
+    defaultFileBrowser: IDefaultFileBrowser
   ) => {
     console.log('JupyterLab extension tvb-ext-bucket is activated!');
 
     // set up the default file browser
-    JpFileBrowser.current = fileBrowserFactory.createFileBrowser('default');
+    JpFileBrowser.current = defaultFileBrowser;
 
     const id = 'tvb-ext-bucket';
     const sidebar = new BucketWidget();
diff --git a/yarn.lock b/yarn.lock
index 90dc550..075e0bf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1984,19 +1984,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@jest/types@npm:^26.6.2":
-  version: 26.6.2
-  resolution: "@jest/types@npm:26.6.2"
-  dependencies:
-    "@types/istanbul-lib-coverage": ^2.0.0
-    "@types/istanbul-reports": ^3.0.0
-    "@types/node": "*"
-    "@types/yargs": ^15.0.0
-    chalk: ^4.0.0
-  checksum: a0bd3d2f22f26ddb23f41fddf6e6a30bf4fab2ce79ec1cb6ce6fdfaf90a72e00f4c71da91ec61e13db3b10c41de22cf49d07c57ff2b59171d64b29f909c1d8d6
-  languageName: node
-  linkType: hard
-
 "@jest/types@npm:^29.6.3":
   version: 29.6.3
   resolution: "@jest/types@npm:29.6.3"
@@ -3517,15 +3504,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/yargs@npm:^15.0.0":
-  version: 15.0.19
-  resolution: "@types/yargs@npm:15.0.19"
-  dependencies:
-    "@types/yargs-parser": "*"
-  checksum: 6a509db36304825674f4f00300323dce2b4d850e75819c3db87e9e9f213ac2c4c6ed3247a3e4eed6e8e45b3f191b133a356d3391dd694d9ea27a0507d914ef4c
-  languageName: node
-  linkType: hard
-
 "@types/yargs@npm:^17.0.8":
   version: 17.0.33
   resolution: "@types/yargs@npm:17.0.33"
@@ -4347,7 +4325,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"bs-logger@npm:0.x":
+"bs-logger@npm:0.x, bs-logger@npm:^0.2.6":
   version: 0.2.6
   resolution: "bs-logger@npm:0.2.6"
   dependencies:
@@ -4365,7 +4343,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"buffer-from@npm:1.x, buffer-from@npm:^1.0.0":
+"buffer-from@npm:^1.0.0":
   version: 1.1.2
   resolution: "buffer-from@npm:1.1.2"
   checksum: 0448524a562b37d4d7ed9efd91685a5b77a50672c556ea254ac9a6d30e3403a517d8981f10e565db24e8339413b43c97ca2951f10e399c6125a0d8911f5679bb
@@ -4487,13 +4465,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"ci-info@npm:^2.0.0":
-  version: 2.0.0
-  resolution: "ci-info@npm:2.0.0"
-  checksum: 3b374666a85ea3ca43fa49aa3a048d21c9b475c96eb13c133505d2324e7ae5efd6a454f41efe46a152269e9b6a00c9edbe63ec7fa1921957165aae16625acd67
-  languageName: node
-  linkType: hard
-
 "ci-info@npm:^3.2.0":
   version: 3.9.0
   resolution: "ci-info@npm:3.9.0"
@@ -6450,17 +6421,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"is-ci@npm:^2.0.0":
-  version: 2.0.0
-  resolution: "is-ci@npm:2.0.0"
-  dependencies:
-    ci-info: ^2.0.0
-  bin:
-    is-ci: bin.js
-  checksum: 77b869057510f3efa439bbb36e9be429d53b3f51abd4776eeea79ab3b221337fe1753d1e50058a9e2c650d38246108beffb15ccfd443929d77748d8c0cc90144
-  languageName: node
-  linkType: hard
-
 "is-core-module@npm:^2.13.0, is-core-module@npm:^2.5.0":
   version: 2.15.0
   resolution: "is-core-module@npm:2.15.0"
@@ -7202,20 +7162,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"jest-util@npm:^26.1.0":
-  version: 26.6.2
-  resolution: "jest-util@npm:26.6.2"
-  dependencies:
-    "@jest/types": ^26.6.2
-    "@types/node": "*"
-    chalk: ^4.0.0
-    graceful-fs: ^4.2.4
-    is-ci: ^2.0.0
-    micromatch: ^4.0.2
-  checksum: 3c6a5fba05c4c6892cd3a9f66196ea8867087b77a5aa1a3f6cd349c785c3f1ca24abfd454664983aed1a165cab7846688e44fe8630652d666ba326b08625bc3d
-  languageName: node
-  linkType: hard
-
 "jest-util@npm:^29.0.0, jest-util@npm:^29.7.0":
   version: 29.7.0
   resolution: "jest-util@npm:29.7.0"
@@ -7458,7 +7404,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"json5@npm:2.x, json5@npm:^2.1.2, json5@npm:^2.2.3":
+"json5@npm:^2.1.2, json5@npm:^2.2.3":
   version: 2.2.3
   resolution: "json5@npm:2.2.3"
   bin:
@@ -7636,7 +7582,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"lodash.memoize@npm:4.x":
+"lodash.memoize@npm:4.x, lodash.memoize@npm:^4.1.2":
   version: 4.1.2
   resolution: "lodash.memoize@npm:4.1.2"
   checksum: 9ff3942feeccffa4f1fafa88d32f0d24fdc62fd15ded5a74a5f950ff5f0c6f61916157246744c620173dddf38d37095a92327d5fd3861e2063e736a5c207d089
@@ -7664,7 +7610,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"lodash@npm:4.x, lodash@npm:^4.17.20, lodash@npm:^4.17.21, lodash@npm:^4.17.4, lodash@npm:^4.7.0":
+"lodash@npm:^4.17.20, lodash@npm:^4.17.21, lodash@npm:^4.17.4, lodash@npm:^4.7.0":
   version: 4.17.21
   resolution: "lodash@npm:4.17.21"
   checksum: eb835a2e51d381e561e508ce932ea50a8e5a68f4ebdd771ea240d3048244a8d13658acbd502cd4829768c56f2e16bdd4340b9ea141297d472517b83868e677f7
@@ -7725,7 +7671,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"make-error@npm:1.x":
+"make-error@npm:1.x, make-error@npm:^1.3.6":
   version: 1.3.6
   resolution: "make-error@npm:1.3.6"
   checksum: b86e5e0e25f7f777b77fabd8e2cbf15737972869d852a22b7e73c17623928fccb826d8e46b9951501d3f20e51ad74ba8c59ed584f610526a48f8ccf88aaec402
@@ -7839,7 +7785,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"micromatch@npm:^4.0.2, micromatch@npm:^4.0.4, micromatch@npm:^4.0.5":
+"micromatch@npm:^4.0.4, micromatch@npm:^4.0.5":
   version: 4.0.7
   resolution: "micromatch@npm:4.0.7"
   dependencies:
@@ -8038,7 +7984,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"mkdirp@npm:1.x, mkdirp@npm:^1.0.3, mkdirp@npm:^1.0.4":
+"mkdirp@npm:^1.0.3, mkdirp@npm:^1.0.4":
   version: 1.0.4
   resolution: "mkdirp@npm:1.0.4"
   bin:
@@ -9135,21 +9081,21 @@ __metadata:
   languageName: node
   linkType: hard
 
-"semver@npm:7.x, semver@npm:^7.3.4, semver@npm:^7.3.5, semver@npm:^7.5.3, semver@npm:^7.5.4":
-  version: 7.6.3
-  resolution: "semver@npm:7.6.3"
+"semver@npm:^6.3.0, semver@npm:^6.3.1":
+  version: 6.3.1
+  resolution: "semver@npm:6.3.1"
   bin:
     semver: bin/semver.js
-  checksum: 4110ec5d015c9438f322257b1c51fe30276e5f766a3f64c09edd1d7ea7118ecbc3f379f3b69032bacf13116dc7abc4ad8ce0d7e2bd642e26b0d271b56b61a7d8
+  checksum: ae47d06de28836adb9d3e25f22a92943477371292d9b665fb023fae278d345d508ca1958232af086d85e0155aee22e313e100971898bbb8d5d89b8b1d4054ca2
   languageName: node
   linkType: hard
 
-"semver@npm:^6.3.0, semver@npm:^6.3.1":
-  version: 6.3.1
-  resolution: "semver@npm:6.3.1"
+"semver@npm:^7.3.4, semver@npm:^7.3.5, semver@npm:^7.5.3, semver@npm:^7.5.4, semver@npm:^7.6.3":
+  version: 7.6.3
+  resolution: "semver@npm:7.6.3"
   bin:
     semver: bin/semver.js
-  checksum: ae47d06de28836adb9d3e25f22a92943477371292d9b665fb023fae278d345d508ca1958232af086d85e0155aee22e313e100971898bbb8d5d89b8b1d4054ca2
+  checksum: 4110ec5d015c9438f322257b1c51fe30276e5f766a3f64c09edd1d7ea7118ecbc3f379f3b69032bacf13116dc7abc4ad8ce0d7e2bd642e26b0d271b56b61a7d8
   languageName: node
   linkType: hard
 
@@ -9948,26 +9894,40 @@ __metadata:
   languageName: node
   linkType: hard
 
-"ts-jest@npm:^26.0.0":
-  version: 26.5.6
-  resolution: "ts-jest@npm:26.5.6"
+"ts-jest@npm:^29.0.0":
+  version: 29.2.5
+  resolution: "ts-jest@npm:29.2.5"
   dependencies:
-    bs-logger: 0.x
-    buffer-from: 1.x
-    fast-json-stable-stringify: 2.x
-    jest-util: ^26.1.0
-    json5: 2.x
-    lodash: 4.x
-    make-error: 1.x
-    mkdirp: 1.x
-    semver: 7.x
-    yargs-parser: 20.x
+    bs-logger: ^0.2.6
+    ejs: ^3.1.10
+    fast-json-stable-stringify: ^2.1.0
+    jest-util: ^29.0.0
+    json5: ^2.2.3
+    lodash.memoize: ^4.1.2
+    make-error: ^1.3.6
+    semver: ^7.6.3
+    yargs-parser: ^21.1.1
   peerDependencies:
-    jest: ">=26 <27"
-    typescript: ">=3.8 <5.0"
+    "@babel/core": ">=7.0.0-beta.0 <8"
+    "@jest/transform": ^29.0.0
+    "@jest/types": ^29.0.0
+    babel-jest: ^29.0.0
+    jest: ^29.0.0
+    typescript: ">=4.3 <6"
+  peerDependenciesMeta:
+    "@babel/core":
+      optional: true
+    "@jest/transform":
+      optional: true
+    "@jest/types":
+      optional: true
+    babel-jest:
+      optional: true
+    esbuild:
+      optional: true
   bin:
     ts-jest: cli.js
-  checksum: 6f65ad4fe67ab3f0fd4c7f9954acbee863af05b2b3f88dd0f490bbcdc58002960fac908b2cb9f009ec14da6fe13cb00a39e291260d6e555abe72448d1c0a017f
+  checksum: d60d1e1d80936f6002b1bb27f7e062408bc733141b9d666565503f023c340a3196d506c836a4316c5793af81a5f910ab49bb9c13f66e2dc66de4e0f03851dbca
   languageName: node
   linkType: hard
 
@@ -10061,7 +10021,7 @@ __metadata:
     stylelint-config-standard: ^34.0.0
     stylelint-csstree-validator: ^3.0.0
     stylelint-prettier: ^4.0.0
-    ts-jest: ^26.0.0
+    ts-jest: ^29.0.0
     typescript: ~5.0.2
     webpack: ^5.0.0
     yjs: ^13.5.40
@@ -10830,7 +10790,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"yargs-parser@npm:20.x, yargs-parser@npm:^20.2.9":
+"yargs-parser@npm:^20.2.9":
   version: 20.2.9
   resolution: "yargs-parser@npm:20.2.9"
   checksum: 8bb69015f2b0ff9e17b2c8e6bfe224ab463dd00ca211eece72a4cd8a906224d2703fb8a326d36fdd0e68701e201b2a60ed7cf81ce0fd9b3799f9fe7745977ae3