I often import STL files for minor modifications for 3D printing.
On a lot of models, there’s no importation problem, but sometimes, the STL is not repaired correctly, and a lot of meshes are empty. Even if I try to repair with Solid inspector, I can’t get a solid, or I have to fill one by one the hundreds holes left.
Then import it at a larger size to avoid the tiny face issue. After you import it, run CleanUp3 to clean up the unneeded coplanar edges. Modifying the model and fixing any errors that may remain will be easier.