How do I save an image to the device?

My problem is the same like this topic:

I select an image and then set “image.Picture” to the selection ( ex: /storage/emulated/0/DCIM/Camera/xxxxx.jpg )

If I set a label to this value it will be set correctly (/storage/emulated/0/DCIM/Camera/xxxxx.jpg), but in the image.Picture the image not load. Stay blank