I too am encountering this issue with the latest Xcode and macOS version. Filed FB9856601.

I was able to get this to work in my scenario by reordering my subviews which caused it to be able to find the scroll view. I also filed feedback with a sample project to improve the logic so that’s not necessary.

No, this API only presents the email compose interface. I wondered about this too and this is what I’d recommend to best support third party email apps: https://stackoverflow.com/a/66379220/1795356

See answer here on Stack Overflow - https://stackoverflow.com/questions/62940266/does-changing-the-default-email-app-affect-mfmailcomposeviewcontroller-usage/66379220#66379220

I have this exact question. Did you find a solution that doesn't duplicate the videos?