Uploading Scratch files

Please help!  Our lab is older and when my students try to upload their projects onto the Scratch website it never finishes loading therefore I am stuck and I'd like to figure out a way that students can share their projects with each other.  Does anyone have any ideas???  Their projects are on the desktop right now and I am having issues using a jump drive and even uploading them to our server isn't responding well??? Thanks for any support ideas you can offer.