Directory not found error when uploading from iPhone single movie to WD

I get the error “Directory not found (404 12.20)” when trying to upload single files (e.g. a specific movie) from my iPhone to WD My Book device.

The files/movies are absolutely OK and not corrupted.

Other files work without problems and also the access / permissions to the folder is no issue.

Does somebody have a solution?


What application are you using?

Into what device are you uploading the file?