On Android when you try to Take a Photo to go into a sketch field the photo does not appear in the app!
This seems like a bug to me. I’m pretty sure it worked a few months ago.
Furthermore Choose Existing is restricted to just photo apps on the device rather than allowing access to image files across the whole of the storage including Google Drive.
I reported this over a year ago and it’s still not fixed.
All other apps on Android let you choose content masked by an image file type of image. (By using the correct INTENT code!)