No tray menu after installing `libappindicator` (as prompted) on F42

Hello, I started getting a dialog box a few days ago saying that nautilus-dropbox will start requiring the use of `libappindicator` going forward, and while I had a (technically) functional setup on all my Fedora machines (see #150 ), I installed `libappindicator` and now get no tray menu at all.

Should I have had installed it after the cutoff date shown in the dialog box? Thank you.