Errors when migrating assets from megascans and failures when opening a session in UEFN

I’m trying to make a realistic large forest map in UEFN using assets from megascans. I made a small box to test everything, the plants and the trees. I clicked on “Open Session” and a bar started loading where the asset names appear. At the top, it says “Make resources private.” When loading, I clicked on “Save Selection” and it got stuck at 50% loading. I’ve deleted a lot of stuff, and the assets I have are from megascans Beech and megascans Medieval Village. Please, if anyone knows how to fix this or if there are any assets available to create a realistic forest without these issues, let me know. Also, if anyone knows where I can get the foliage that appears on the Epic Games map “The Forest Guardian,” I’d be grateful because if it worked for them, I guess it will for me too.