So, I was able to manipulate my sockets in the past. Lately I can’t. What am I probably doing wrong?
://i.imgur/4SBQVW6.png
Delete your socket and the mesh and then: do a right click onto the right hand - add socket - give it a name - go to your content browser - drag and drop the mesh onto the socket
Now something like a dropdown bar should appear at the socket with that you can hide/unhide the mesh in the list -> now it should work to move it around 
This is how it should normally look like:
Oh yeah. That explains why it’s above it in the list. Thanks 
Edit: figured it out. Do NOT name your socket the same as the bone it’s in. The mesh will just ignore the socket and attach to the parent every time.