Jon Tereba commented
It would be great to be able to share a folder with just an upload link. There are times when we need to have an external user upload files into a folder and they would like to share that link with others. In this sense, it is technically an anonymous link as anyone can use it, however, we don't want the users who have the link to be able to see what is in the directory in the event that it is compromised. If a customer needs to share a document with us but we don't want them to see the files in the folder, there isn't a way to do this right now.