FIX FOR DELINKING OF TEXTURES AND MATERIALS
UE4 Version 22.3
So sometimes I find when I just move things into the content folder of another project that delinking thing occurs. It’s nigh on impossible unless it’s small to re-link everything unless its a small project. What you want to do is MIGRATE the assets over from the project itself. However now for problem 2, it doesn’t open when you double click it. I managed to get it to open by going into the epic games launcher, launching the game engine, then clicking browse and selecting the project that way. After a while, it finally opened (With the landscape not textured properly but ah well) and I migrated EVERYTHING directly to the content folder of my game. Now when you open your game there will be folders everywhere, but at least its all linked and working. You can move all the folders (maps, material, meshes, particle, player_assets, showcase_assets and textures) to another folder (i called it foilagestarter) and it will slowly move it all with the links for you. Sometimes the folders won’t disappear from your content section, they are just empty and refuse to delete. Fix up redirectors and then delete them off using file explorer.
Hope it helps! Took me a little while to workout with my shitbox laptop