You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
I have the same issue even with 2023.2.12. I’ve tried logging out of my Apple account, then starting again by scanning in the QR code and authorizing. Still getting the same “Choose Media Source.” Frustrating!