After the recent (Nov 2022) AGOL and Instant App updates, the Introduction panel button has shifted off screen when viewing the Attachment Viewer App on iOS iPhone devices. This makes it difficult or impossible to close out of the introduction panel to open the map/attachment screen. This issue occurs in Chrome, Safari, and Firefox browsers on iPhone.
Thanks for reaching out about this. Can you share a screenshot of what you are seeing on a mobile device? I think I am also seeing this too but wanted to confirm we are seeing the same thing. I am seeing the button at the bottom of the introduction panel shifting below the page.
Yep, I am seeing that too. We are currently looking into it on our end. In the meantime, if you click the little 'i' icon next to the title in the app that will also close the introduction panel.