Uploading Custom Template

I have. a template that I have used for years with the students. It has wood grain loaded in the paint bucket and has dimensions set up a specific way for our cabinetmaking class. Is there a way a user can upload a file and then save it as the default template like you can in the desktop version?

This link is to the template I use with my kids

The option for the web versions would be to have them open that .skp file before starting a new project and work in that file.