Have been using Sublime3 on Windows and several Linux distro's and have not seen this problem before.
This concerns Sublime 3 (build 3176). Installed the .deb through the recommended method. Running it on Devuan (which is more or less Debian 9, but withoud systemd).
I have an OpenVPN connection to my server and have made a network drive in my filemanager (Caja, which I also used on Solus linux without a problem) to a samba share.
When I have a file there, say, index.html, I rightclick and 'open with' and select sublime. Sublime opens but doesn't fetch the file. Opening the file from within Sublime doesn't work either.
I can open the file when I put it on a local drive. I can also open the file from the samba share with other applications.
Really weird. Has anybody else encountered this (and more important: solved it)?