diff --git a/docs/source/admin/fs/rest.rst b/docs/source/admin/fs/rest.rst
index 02ebeea8c..7b965b3c5 100644
--- a/docs/source/admin/fs/rest.rst
+++ b/docs/source/admin/fs/rest.rst
@@ -143,7 +143,7 @@ You will get back your document as it has been stored by elasticsearch:
      }
    }
 
-If you started FSCrawler in debug mode with ``--debug`` or if you pass
+If you started FSCrawler in debug mode or if you pass
 ``debug=true`` query parameter, then the response will be much more
 complete:
 
@@ -279,6 +279,15 @@ The field ``external`` doesn't necessarily be a flat structure. This is a more a
       }
     }
 
+You can use this technique to add for example the filesize of the file your are uploading::
+
+.. code:: sh
+
+    echo "This is my text" > test.txt
+    curl -F "file=@test.txt" \
+      -F "tags={\"file\":{\"filesize\":$(ls -l test.txt | awk '{print $5}')}}" \
+      "http://127.0.0.1:8080/fscrawler/_document"
+
 .. attention:: Only standard :ref:`FSCrawler fields <generated_fields>` can be set outside ``external`` field name.
 
 Remove a document
diff --git a/integration-tests/src/test/java/fr/pilato/elasticsearch/crawler/fs/test/integration/elasticsearch/FsCrawlerRestIT.java b/integration-tests/src/test/java/fr/pilato/elasticsearch/crawler/fs/test/integration/elasticsearch/FsCrawlerRestIT.java
index 0cee30850..76bda1e3f 100644
--- a/integration-tests/src/test/java/fr/pilato/elasticsearch/crawler/fs/test/integration/elasticsearch/FsCrawlerRestIT.java
+++ b/integration-tests/src/test/java/fr/pilato/elasticsearch/crawler/fs/test/integration/elasticsearch/FsCrawlerRestIT.java
@@ -149,7 +149,7 @@ public void testUploadDocumentWithIdUsingPut() throws Exception {
         // We wait until we have our document
         ESSearchResponse response = countTestHelper(new ESSearchRequest().withIndex(getCrawlerName()), 1L, null);
         assertThat(response.getHits().get(0).getId(), is("1234"));
-        assertThat(JsonPath.read(response.getHits().get(0).getSource(), "$.file.filesize"), notNullValue());
+        assertThat(JsonPath.read(response.getHits().get(0).getSource(), "$.file.filesize"), greaterThan(0));
     }
 
     @Test
@@ -224,7 +224,14 @@ public void testAllDocumentsWithRestExternalIndex() throws Exception {
                 .timeValueMinutes(2));
         for (ESSearchHit hit : response.getHits()) {
             assertThat(JsonPath.read(hit.getSource(), "$.file.extension"), notNullValue());
-            assertThat(JsonPath.read(hit.getSource(), "$.file.filesize"), notNullValue());
+            int filesize = JsonPath.read(hit.getSource(), "$.file.filesize");
+            if (filesize <= 0) {
+                // On some machines (ie Github Actions), the size is not provided
+                logger.warn("File [{}] has a size of [{}]",
+                        JsonPath.read(hit.getSource(), "$.file.filename"), filesize);
+            } else {
+                assertThat(JsonPath.read(hit.getSource(), "$.file.filesize"), greaterThan(0));
+            }
         }
     }
 
@@ -249,7 +256,7 @@ public void testDocumentWithExternalTags() throws Exception {
         checkDocument("add_external.txt", hit -> {
             assertThat(JsonPath.read(hit.getSource(), "$.content"), containsString("This file content will be extracted"));
             assertThat(JsonPath.read(hit.getSource(), "$.file.extension"), notNullValue());
-            assertThat(JsonPath.read(hit.getSource(), "$.file.filesize"), notNullValue());
+            assertThat(JsonPath.read(hit.getSource(), "$.file.filesize"), greaterThan(0));
             expectThrows(PathNotFoundException.class, () -> JsonPath.read(hit.getSource(), "$.meta"));
             assertThat(JsonPath.read(hit.getSource(), "$.external.tenantId"), is(23));
             assertThat(JsonPath.read(hit.getSource(), "$.external.company"), is("shoe company"));
@@ -265,7 +272,7 @@ public void testDocumentWithExternalTags() throws Exception {
         checkDocument("replace_content_and_external.txt", hit -> {
             assertThat(JsonPath.read(hit.getSource(), "$.content"), is("OVERWRITTEN CONTENT"));
             assertThat(JsonPath.read(hit.getSource(), "$.file.extension"), notNullValue());
-            assertThat(JsonPath.read(hit.getSource(), "$.file.filesize"), notNullValue());
+            assertThat(JsonPath.read(hit.getSource(), "$.file.filesize"), greaterThan(0));
             expectThrows(PathNotFoundException.class, () -> JsonPath.read(hit.getSource(), "$.meta"));
             assertThat(JsonPath.read(hit.getSource(), "$.external.tenantId"), is(23));
             assertThat(JsonPath.read(hit.getSource(), "$.external.company"), is("shoe company"));
@@ -281,7 +288,7 @@ public void testDocumentWithExternalTags() throws Exception {
         checkDocument("replace_content_only.txt", hit -> {
             assertThat(JsonPath.read(hit.getSource(), "$.content"), is("OVERWRITTEN CONTENT"));
             assertThat(JsonPath.read(hit.getSource(), "$.file.extension"), notNullValue());
-            assertThat(JsonPath.read(hit.getSource(), "$.file.filesize"), notNullValue());
+            assertThat(JsonPath.read(hit.getSource(), "$.file.filesize"), greaterThan(0));
             expectThrows(PathNotFoundException.class, () -> JsonPath.read(hit.getSource(), "$.meta"));
             expectThrows(PathNotFoundException.class, () -> JsonPath.read(hit.getSource(), "$.external"));
         });