iOs Sync error 200


We are using nextcloud to sync files from an smb share to iOs devices.
When we check (in the nextcloud App on the iOs device) a folder as ‘make offline available’ it will not sync all files (in subfolders) complete. Some file get a red warning with a code of 200. when ticking on the files the files will downloaded without any problem.
Any suggestions?

Thank for replying.