I use a script to mount my shared folders from my NAS-server. The NAS supports samba and NFS. From my Raspberry Pi with Kodi I use MFS and that works super fast. However, from my notebook with Tumbleweed, I mount with CIFS and that is much slower.
I need RW acces from my notebook, and the NAS is password protected. I use a mount command like this:
mount -t cifs -o username=xxxx,password=yyyy,uid=1000,file_mode=0660,dir_mode=0770 //192.168.178.xx/directory /home/user/folder/directory
I could not figure out what the respective mount command for the script would be with username and password for NFS. I tried
sudo mount -t nfs 192.168.178.xx:/directory /home/user/folder/directory
My assumption is that your user(s) try to write to files (and directories) of which (s)he/they is/are not the owners or have no write permission. But that is normal for every Unix/Linux file where ownership and permissions do not match which the user(s) that want to access.
You can, as root, see who is the owner of the files and what the permissions are there