Help save/load????

I'm an art teacher. I use drawingnow.com in my class often, but have never been able to help a student successfully save a drawing and then reload it to work on it the next day. It always saves as a .dra file and then can't be reopened. I created an account today, thinking that that may be the issue. Still can't load the file that I saved from this site. Please help?

HEY! I found out out that if u rename the file it will allow you to save it along with other .dra files!