Check movement before using the rig.
Review the fitted skeleton and deformation, then take the FBX into your Unreal project.
On this page
Look beyond the rest pose
Inspect the available animation preview and quality warnings. Pay particular attention to shoulders, elbows, knees, wrists and hands. A correct-looking rest pose can still deform poorly during movement.
Download the FBX promptly
The generated result is temporary. Download the rigged FBX while it is available; do not assume an account record or the uploaded source preserves the downloadable rig indefinitely.
The output targets the UE5 Manny skeleton. Check skeleton assignment and animation compatibility in your destination project rather than assuming every skeleton asset is interchangeable.
Unreal may log "Imported skeletal mesh has some invalid bind poses. Skeletal mesh skinning has been rebind using the time zero pose." when it imports a RigMaster FBX. This is expected and harmless: the file carries the rig in its rest pose, so the rebind gives the same skeleton, skinning and animation playback.
Apply with Desktop
Apply in UE5 imports the rig into a fresh asset location through Desktop. Inspect the skeletal mesh, animation playback and material setup in Unreal before using it in gameplay.