I have a samba share running on my server (just an Intel N100 Mini PC). It’s running Fedora Atomic and my desktop is also running Fedora Atomic.
While it’s good enough to watch videos on, reliability when it comes to uploading files to it has been very poor. The connection ends up timing out after a few minutes of uploading.
I found that using rsync to upload files to it has been a lot more reliable.
Could be this https://omnitech.net/reference/2023/03/15/0x8007003b-timeout-copying-large-file-to-samba-server/
Or could be if you copy it via Nautilus GUI, people have suggests doing a straight cp from CLI has better results than Nautilus.
I have the same issue with sftp and webdav. (20GB zip file)
Maybe a buffer issue, does scp work?