Still the /run/media - is readonly - and your actions are unpredicatable.
That won’t work - /run/media is volatile and is recreated on every system start.
See → above Mount SMB share via CLI gives no write permission - #2 by linux-aarhus
$ ls -la /run/media
total 0
drwxr-xr-x 2 root root 40 28 maj 16:40 .
drwxr-xr-x 40 root root 1080 10 jun 15:54 ..
If you need a - on the fly mount - you could use something like
this → [root tip] [Utility Script] GIO mount samba share
Another topic on basic sharing is
this → [root tip] [How To] Share and Access NTFS devices using Samba
Mounting a network share in /etc/fstab can cause unexpected errors and delays on boot.