The web based exporter can be very handy BUT the moment the web service has problems
you cannot get your file exported. This problem happened in my class room multiple times making this unreliable.
While 98% it always worked the 2% it does not work is very problematic when under a time crunch.
Fusion offers already STL export with a meshing setting and OBJ export for T-Splines.
Every program can also offer OBJ with meshing settings and material properties which is why it trumps STL
even for color 3D printing thus there should be no reason or excuse for not offering it in Fusion too.
This can also be extended to the SketchUp exporter.