[Solved] Help joining UVs

I have made an object frankenmesh and was able to combine the existing uv maps from each component into one map.  However, I also have an added mesh part that I created and have unwrapped.  When I try to join it to the studio mesh, it seems to be deleting the uv map I had made before and only keeping the map from the new mesh part! D:

How do I keep both unwrapped parts without change on the same map as I combine the meshes?

Thank you!