For -21grams – Sharing the folder may in fact be a risk as it looks like it allows others to edit the content of the folder? I can see an option which seems to allow me to upload files to the same folder.
For -21grams – I don’t think you need to share the folder. The folder shows a separate link for each file to right where it says download. You can copy the links from there. It looks like there are no limitations on download.