This might help you fix your broken metahuman fingers.
This tutorial assumes you made it far enough following some other video tutorial and have a IK rig and IK Retarget asset created already.
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Make sure you set up your IK retarget asset’s Chain Mapping so that any Metacarpal or Twist2 joint is set to none.
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Once you change the chain mapping, select your marketplace animations, right click and select this option
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Select your RTG_UE4Manny_MetaHuman asset
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Select “Change” and select a folder you wish to put your soon to be retargeted animations
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Press “Retarget”
That should help fix your fingers.