This may be a dumb question, but did the ability to upload a favicon entirely disappear?
Documentation (and my memory) indicates it should be under Settings > General > General Appearance. But it seems entirely absent? And I can’t find it anywhere else.
Well, this is super weird… it’s there on my app that’s on a paid plan, and until I just refreshed the editor for my sandbox app (which is on the free plan and I have had open all day), there was a placeholder for it under General >> General Appearance with a button to upgrade in order to access it. But, after I refreshed the editor on my free app, the placeholder disappeared. Is your app on the free plan?
I’m experiencing this same issue on a starter plan as well. I also manage a site on the Professional (legacy) plan and the favicon setting is nowhere to be seen there either.