Android client doesn't sync all files


I’m trying to sync some folders (essentially media folders) from my Android 9 device to a Nextcloud server (docker Nextcloud Hub II, installed on a local server ) but only few files are actually synchronized by the client (3.18.0).

All folders are marked as in cloud in “Automatiches Hochladen” but on the server i find only few files.

Maybe is there a limit I should set?

Best regards