I'm trying to share a Mathematica notebook between a MacBook Air running 12.2 and a Raspberry Pi running 12.1 using a Samba server. E.g. Edit from either system, but not at the same time.

With the notebook file stored on the Samba drive:

• Mathematica(Licensed) on the MacBook can read and write the notebook on the drive just fine.
• Mathematica on the Raspberry Pi can read the notebook on the drive fine, but cannot save the file.

When saving I get the message: "Could not read some data from your file. You may have a problem with your disk, or you may not have the file system permission to read the file."

A text file editor on the Raspberry Pi can edit a text file in the same network directory just fine. So, it would not appear to be simply permissions or Samba config. (see ls -la below) Mathematica seems to be running as pi.

Here is the directory and ps (I am trying to access FS21.nb):

pi@raspberrypi:/run/user/1000/gvfs/smb-share:server=rpismb.local,share=finsmb/FS21 $ ls -la
total 46
drwx------ 1 pi pi     0 Apr 10 16:42 .
drwx------ 1 pi pi     0 Jun  5 09:14 ..
drwx------ 1 pi pi     0 May 18 15:17 data
-rwx------ 1 pi pi  4096 May 21 22:13 ._.DS_Store
-rwx------ 1 pi pi  6148 Apr 11 12:05 .DS_Store
-rwx------ 1 pi pi  4096 May 21 22:13 ._FS21
drwx------ 1 pi pi     0 Apr 10 16:07 FS21
-rwx------ 1 pi pi  4096 Jun  5 09:15 ._FS21.nb
-rwx------ 1 pi pi 18008 Jun  5 09:15 FS21.nb << Accessing this file
drwx------ 1 pi pi     0 May 19 08:11 .git
-rwx------ 1 pi pi  4096 May 21 22:13 ._.gitignore
-rwx------ 1 pi pi   111 Apr 10 16:42 .gitignore
-rwx------ 1 pi pi   398 Jun  7  2020 .project
-rwx------ 1 pi pi  4096 May 21 22:13 ._Tools
drwx------ 1 pi pi     0 Apr 29 09:33 Tools
-rwx------ 1 pi pi   114 Feb 16 20:39 .WolframResources
pi@raspberrypi:/run/user/1000/gvfs/smb-share:server=rpismb.local,share=finsmb/FS21 $ ps -ef | grep Mathematica
pi        8673  8578  0 09:55 pts/1    00:00:00 grep --color=auto Mathematica
pi@raspberrypi:/run/user/1000/gvfs/smb-share:server=rpismb.local,share=finsmb/FS21 $ 

Confirmed the file name being accessed is networked version using

AbsoluteCurrentValue[Notebooks[],"NotebookFullFileName"]

I could not find a way for Mathematica to tell me the permissions it was seeing.

Is there a way to see the permissions Mathematica is seeing, or another better idea?

P.S. Get the same error if I simply copy a notebook from the Pi to the Samba and try to edit it there.