Selecting a file to download to FMGo from dropbox using the download button in FMGo, the file does not download. Onedrive did not work either. iCloud Drive and Google Drive appeared to work.
1. In FMGo select the device icon, 2. Select the download icon, 3. Select location and select dropbox, 4. Select the desired FMP database.
Work around. Open Dropbox then export file to FMGo.