After I open a PDF in Acrobat Pro (most updated version) from Dropbox in the Finder, then close the file, it does not appear in my Recent Files list. If I open a PDF from my local machine it does appear, but I do all of my work in my Dropbox folder. A recent files list that does not show recent files is not useful at all.

I tried adding Dropbox to the Other file storage list in the sidebar, but that just shows me the root of my Dropbox folder, not the recent files.