Shell Feature not working for complex object

[Anonymous]

So I am very new to Autodesk and I was trying to make a thin skin for a finger scan I have. When I tried to shell out the scan I just get error messages that say "Error: The body could not be repaired after deleting faces.
Try changing the selection, or use the Delete tool in the Patch workspace to delete geometry without repairing the gap." I am not sure how to fix this or if I have other options. What can I do to make this work?

[TheCADWhisperer]

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@Anonymous wrote:

... What can I do to make this work?

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I recommend not using planar faceted triangular stl in Fusion.

Model from scratch 

or

try using Autodesk Mesh Mixer.

[Anonymous]

So I should use mesh mixer to convert the triangular mesh to some other kind of mesh and the shell feature will work?

[TheCADWhisperer]

Attempt to do the Shell in MeshMixer.