How do students send me Scratch 2.0 projects?

 I created a Studio so that I could copy and paste my students' URL links into it and view/grade projects but I get the "Project not found" message.  What am I doing wrong?

Should I add all my students as "curators" and have them send projects that way?

Help.  What is the best way for students to send and I receive Scratch 2.0 projects and well as have them view each other's work?

Thanks.