upload files to a canvas and share it with anyone – no account needed. Start by dragging a file or several files onto the canvas to upload them. Once all the files are uploaded, a unique link will be generated for the canvas you’ve just created. You can give this link to anyone or share it via email, Facebook, Twitter or Reddit. The person receiving the link has access to the canvas, can preview the files if they’re images, download them, rename them, remove them and upload more files to this canvas.A canvas is limited to 5GB, but you can create as many as you wish, so there is no actual limit to the amount of files you can store and share this way. You can create a Dropcanvas account for better management options of your canvases.
This is an interesting and simple back channel tool. It doesn't require registration and you can also share a whole range of different file types through it. This could be a great way to run a paperless classroom.
Volafile.io is the only place for real time filesharing on the internet.