Add external usb drive to plex server on Synology

Ok, so here is my problem.
I have a lot of cold drives containing my movies and series, i put them in an external enclosure connected to the NAS whenever i need to (using the same enclosure for all as it some kind of rack).
On Synology shared folder i added them as TV Series 1, TV Series 2, etc.
The Synology recognizes them when i plug them in (i guess it uses the unique signature of a drive to make the difference and not the signature of the enclosure).
So now i want to add them to Plex Server, however when i want to add one i cannot as on the Linux directories they are seen as /volumeUSBshare1/ for example, making it impossible to make the difference between the different hard drives.
Is there any way to add through their smb:// link ? And if not is it planned ?
I’m in the middle of trying to move from MySQL (behind Kodi) to Plex Server and on Kodi i would just add on all the connected devices in the sources.xml file the line smb://SynologyIP/TV Series 1 etc…

So no one has any idea how to do it ?
Guess i will have to revert to Kodi and mysql…

Probably going to have to write a script to check the drive and mount it to a static location. I do something similar with a public upload folder on a synology.

I edited some system files to mark down all my drives SN and to mount them always in the same folders.