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• Convert a Simple STL into a Body in Fusion 360
• Convert a Complex STL into a Body in Fusion 360

• MODEL
  • Insert Mesh
  • Do not capture Design History
• PATCH
  • MODIFY / Mesh / Mesh to BRep
• MODEL
  • Capture Design History

Import the STL, Open the imported file (be sure you are not capturing design history at this point), Mesh to Brep, click on PATCH workspace → Modify → Merge, select coplanar faces and merge.

This of course has its limitations. Mainly being it will only work for coplanar faces. If there is a segmented curve it will stay segmented.

http://autode.sk/2nTHRXM