I like the old MakeHuman, which exported rigged characters without making me install a different version of Blender, and worked with send2ue. Being a glutton for punishment, I just *had* to use the mfpb2 Blender extension.
I suppose we don't use the Game engine rig now, but use rigify. What joy, spending a day wrestling with versions, networking, and python errors.
To export I can't seem to use send2ue because, firewall off, it can't find the running Unreal Engine, throwing errors.
What worked for everything (not rigged correctly yet) was to both export as fbx and as glTF. The latter gets the correct materials, but screws up the character's skin. Fbx just gets incorrect materials. The materials from the glTF export work with the fbx export. Gah.
I'm remarkably mellow.