In my case, I see many things in the launcher. Not all items show in the launcher, however. Items that are generic (engine agnostic like FBX or Blender files) don’t show in the launcher. Instead, you download them. This is the piece that does not work.
I did manage to resolve this. Installing the Fab plugin allowed me to download them from within the Unreal editor. It was marginally inconvenient as it wasn’t obvious, but getting them into the project was the ultimate goal so an acceptable workaround for me.