Select all (incuding armature!) Export > glTF 2.0 Settings
- (Limit to) Selected objects = true
- Data > Armature >
Export Deformation Bones Only= true
Drag the .glb file into the content browser.
This makes a monolithic file containing the mesh, skeleton, AND all animations.
Double check the importer. It often tries to use some random skeleton, especially if it the first import (IE you are creating the skeleton.). Make sure it is set to blank.
Check the skeleton asset first. Look to make sure all your bones are there, and that none of the control bones are.
If there is a problem and you go back to Blender to fix things, do NOT try to reimport. Delete EVERYTHING you added into Unreal and start fresh!
Next, check your anims to see if they are all working.