Here are two video tutorials on how to easily publish your models from 3ds Max to Sketchfab. The first tutorial covers how to use the 3ds Max exporter, the other focus’ around manual upload using a .zip file. They also cover multi/sub-object materials so you can upload multiple models with different textures.
3ds Max to Sketchfab using exporter:
3ds Max to Sketchfab using a .ZIP file:
If you have any problems, or would like to contribute for a tutorial, contact us: firstname.lastname@example.org