I have a smb file sharing on my ubuntu desktop. The Apple Files app can’t upload files properly, it uploads only when files are put under a folder and upload the whole folder. Screenshot and error message attached. Please help..🙏

I have a Ubuntu(with KDE) desktop as a samba server, my iPad can view and edit the shared files. But can't upload files properly. But it uploads only when files are put in a folder and upload the whole folder. Edit: Added screen shots