I have an app that is able to receive images from Files/iCloud Drive on iOS, but I haven’t been able to figure out how to share a selected image from the Photos app to my app.
If I take that same image and save it to Photos, I’m unable to share/export it from Photos to my app, either in the simulator or on device.
You’ll need to make a share extension to enable this. I don’t believe it’s possible in Xojo, however. You should be able to make one in Xcode with swift then bundle it with your Xojo iOS app