Can't see EX2 in File Explorer

It’s 4 years later and same problem with two Mycloud EX2 Ultras. I had them both showing in Explorer yesterday after power cycling and managed to transfer a lot of files to the new one. Today neither is listed under Network. I got the older one to show by using a shortcut but it’s not showing in a new Explorer window. The new drive is gone. Madly looking for notes how I fixed it last time.