I have contacted Magix with this as a suggestion. You could do the same: Top right corner > click feedback.
The idea was to have a filesharing program as FL Studios Collab.
In the projects I have made we used box.net (free service) For larger files we use yousendit.com or just a common gmail-account where you can send larger files to.
If you need to send the whole project. you should zip the folder and send it - best thing is - I think - that only one takes care of mixing and producing. It's easy to import mp3- or wav-files.