Can't sync new phone

Having an odd problem.  New phone (Motorola Edge+, Android) doesn't show up in my list of synced devices in LR Classic on my Win10 laptop, and it isn't syncing new photos.  Never had this issue before.  The phone is set to use Firefox as default browser (as are all my devices, including previous phone).  When I open LR on Edge+, my albums show up normally, including photos I've recently added in the usual way.

Following Help instructions to go to LR sync tab in Preferences, message at top says "this browser isn't set up for sync."  If I click its suggestion to "update browser," it seems LR is insisting on using Chrome for sync.  I can't figure out how to tell LR mobile app to use my default browser or why it is trying to use Chrome.

It's possible, of course, that this isn't the actual problem preventing sync.  I'd be happy to provide any additional information if someone has an idea how to get sync working on new phone.  (The previous phone still functions, but only WiFi.  It is turned OFF at the moment.  Its synced photos, of course, remain on my computer.)

Thanks for giving this some thought.