I’ve had this in the past, and I solve it by setting a static ip addres on my drive and manually forwarding the ports in my router. But before trying this, are you able to access the drive from the mobile aps while on your local network?
Yes, I can access it by the mobile apps and through my home network.
I’ve tried a lot of the solutions that have been printed elsewhere but none of them seem to help. It was working fine until the drive did a firmware update about 6 months back then it stopped working.
so many possibilities but since you mention a FW upgrade I would start with a system only restore, this will leave shares and data in place but everything else is reset like new so you need to redo everything else. this can clear up a lot of issues