Way for users to upload documents?

Summary:

We are rolling out a development program in which we would like learners to have access to an Excel document (kind of like a progress monitoring sheet). we would like them to access this xls in the LearnCenter, be able to download it and update it, and then re-upload the finished product in Learn.

Is there a feature that allows for this? I know I can put the xls into Content Manager, but then users can't download it. I also know I can link the xls to a course, and then a learning plan, but then users can't upload it. Not sure if this is possible in Learn or not.