diff --git a/docs/content/linkbox.md b/docs/content/linkbox.md
index 12fa9bfb7..f1bbc8b1c 100644
--- a/docs/content/linkbox.md
+++ b/docs/content/linkbox.md
@@ -138,3 +138,12 @@ Properties:
 
 Invalid UTF-8 bytes will also be [replaced](https://rclone.org/overview/#invalid-utf8),
 as they can't be used in JSON strings.
+
+Linkbox converts file extensions to lower case on upload, so a file
+uploaded as `file.TXT` is stored as `file.txt`.
+
+Linkbox renames an uploaded file to `name(1)` if its name is the start
+of the name of a file already in the same directory, for example when
+uploading `apple` to a directory containing `applebanana`. rclone then
+can't find the file it uploaded and the upload fails with `object not
+found`.
diff --git a/fstest/test_all/config.yaml b/fstest/test_all/config.yaml
index e5fb8d677..2dfded38a 100644
--- a/fstest/test_all/config.yaml
+++ b/fstest/test_all/config.yaml
@@ -598,6 +598,8 @@ backends:
      - TestFixCase
      - TestListDirSorted        # Can't upload files starting with . - FIXME fix with encoding
      - TestListDirSortedFn      # Can't upload files starting with . - FIXME fix with encoding
+     - TestTransform/suffix     # Linkbox lower cases file extensions
+     - TestTransform/truncate   # Linkbox renames a file whose name prefixes another to name(1)
      - TestSyncOverlapWithFilter # Can't upload files starting with . - FIXME fix with encoding
    ignoretests:
      - cmd/bisync