Thanks for the feedback!
First, if you’re not already, I’d recommend installing the Google Drive Backup and Sync app, and using a directory that Drive syncs as your (or one of your) Deepdwn directories.
For integration, this is actually a specific anti-feature of Deepdwn: No integration (dependence) on cloud services, while still allowing users to manage their own storage.
This is why Deepdwn’s files are stored in directories that you select (instead of internal storage, or a database, or similar): so that you can make use of any storage or syncing service that works for you.
Personally, I currently use Syncthing with one note directory synced between all of my devices (laptop/desktop/phone). Hope that helps!