Hi Myerz
I had the same issue and the only way I found I could access across both editors is to create boards and then put the images in there.
Open your media in normal editor. Go to My Boards and create a new board. At the bottom you’ll see a slider for ‘make visible to all my sites’. Activate that and then your boards will be visible in Editor X too. It does mean you’ll need to add all your media to boards though which is a bit of a phaff…I couldn’t find any other way of doing it though. Maybe someone else knows!
Hope that helps
mina