Page not found

Hello:

I am attempting to upload a file to share with a client and there is no way to upload a file because the file page returns a "Page Not Found" error. Apparently there are other with the same issue, but I am unable to see anything that resolves it.

I learned about this feature from Kevin Stohlmeyer at an Adobe user group meetup, and I have never used it before.

Am I missing a step perhaps?

Thanks