[itsme]

That might have been the missing point in my post: I use MSP with "Let MobileSheets manage your files" set to OFF and sync a directory tree that is generally maintained on my PC. So I know where my files are and which one to open.
@LFourel: you might try to edit edit something in Jota and save it via Jota's "Save As" dialog with a .pro extension. Remember the path where you saved it and import it into MSP.