I'm developing a Xamarin Forms Application, and I needed to add a photo from the camera or the gallery. After a lot of research on the Internet, I tested some examples, but they didn't work due to new permissions and changes in the latest versions of Android.
Then then I finally found this :
Media Plugin for Xamarin and Windows
Everything works as expected! Just don't forget to follow the instructions to give all the required permissions and make all the changes needed, and everything will be fine!