Can't connect to mounted USB drives over network after Catalina upgrade
I recently upgraded my iMac to Catalina from Mojave.
When I try to connect to any mounted USB drives from my MBP (el Capitan) over my network, I get an error "The operation can't be completed because the original item >drive name< can't be found.", despite the USB drives being listed as being there:
I booted the iMac into a backupdrive of it's previous Mojave system, and there's no issues...everything works fine with it, so it's something with Catalina.
AFP sharing IS turned off on the iMac (Catalina) but it has been on in this process. The error seems like a location cache problem on the MBP (El Capitan), but I can't find a way to clear that info, if that's what it is (restrarting hasn't fixed it).
Any help would be appreciated.
iMac 27″, macOS 10.15