Got an initial reply from Asustor. Not a complete one, so I've asked for more info. So far no further reply.
I know meaningless replies are the expected norm for customer/technical support, but in the past I've had better-than-average conversations with Asus (routers). Also the initial Asustor reply now was a little better than average, so I'm still hopeful.
I use an AS3104T v1 with OMV5. I installed OMV on the small internal SSD.
How's that SSD connected?
What did you have to do to install OMV?
Can you easily revert back to the Asus OS?