Google drive sometimes doesn’t work fine. Dropbox works much better - try it.
After the first sync on the mobile version, there is a folder named Alzex Finance will be created in Dropbox, iCloud or Google drive. The copy of your data base file will be there - simply open it. Or download this copy to your PC, open it and setup automatic sync with the copy into Dropbox/iCloud/Drive as it's described here: https://www.alzex.com/help/synchronization.html