how can I tell UE to stop creating .fbm files when importing an fbx file?

each time I import my fbx files, UE automatically creates an .fbm file before I even finish the import action. It creates this folder for each file
the .fbm file holds all the maps used on the fbx
even when I tell UE to not import textures or creating an material this .fbm file will always be created

how can I tell UE to stop creating those files?

and each of this folders got like 80MB
I mean yea i can just delete those folders every time but its really annoying
any ideas?

You need to uncheck the “Embed media” or “Embed textures” checkbox when exporting FBX file from your DCC application. I guess this is a feature of the FBX importer, not the engine.