What is the correct storage format for a UNC path?

I’m running this on Windows CLI version 2.0.7. I tried setting a storage path in two ways, and in either case the backups end up on the C:\ drive.

samba://server/share/path/storage
Files end up on C:\server\share\path\storage , not on the network server.

Or I also tried this:
//server/share/path/storage
Same thing, they end up stored on C:\

I’ve been browsing the guides and I must be missing something. Also I saw the source code with samba paths auto corrected to something like this:
\\?\path…
I tried something like that, but it just errors.

The correct format should be samba://\\server\path. This of course is awkward and should be simplified in the next update.