Inserting a selection into a frame

I fill a new blank file with a solid color.

I then select a frame - "gringe mask" from the "Graphics" option
and it places it on that new filled file.

I now select from another image and want to place the selection into
the frame.

This does not work. It seems to "insert" but ...

If I move the selection the frame and all move.  I cannot modify the selection in the frame
and the frame independently.

How can I insert a selection into the frame? How do I do that?