Is there a specific setting I need to adjust to allow photo viewing on a screen mirrored IOS app?

I can see the Piwigo app on the TV, I can see the album list, but when I open an album, the mirror no longer updates - it stays at the album list.

I get the same results on a Firestick and a Samsung TV native app with iphone and ipad, both on current IOS . All other apps behave as expected.

It kind of "feels" like a permissions problem, but I don't see any envious settings.


Thanks.