Cannot sync media

I've been trying to get this program to synchronize my media, and I'm pulling my hair out.

I create a project on my Android device and have it synchronize to the creative cloud. But it doesn't synchronize to my desktop. When I open it there. It tells me that I have files that are missing. And vice versa. When I create a project on my desktop, the files do not synchronize onto my phone.  And yes, I've ticked the box "sync with CC."

Thinking this might be a problem with creative cloud, I signed up for a Dropbox account to see if my media would synchronize from there. Rush shows that I have no media on my Dropbox, and that's not true.

I've uninstalled and reinstalled Rush.  I've deleted all of my assets from CC.

What gives?