Sharing resources between animation teams

I'm a high school teacher, running an approximation of an animation studio. I need the students to create digital assets (in Adobe Animate) and share them with different teams within the classroom.

I do not want to have the student share via Adobe's Creative Cloud, because of potential privacy issues (No fault of Adobe's just very privacy conscious rules here). So is there a simple solution where students can save digital assets and share them with another group?

I've already tried saving assets as a .ana file, but Animate can not load it. 

Currently saving resources as .fla files and using import External Library for animated sequences.

And saving images as PNGs for static resources.

Also, is there a better way?