Is there a way to sync Google Drive to Dolphin?

My dad has several reasons to switch to Plasma, but one big reason he always switches back to Windows:
We haven’t found a non-confusing, reliable way to sync his Google Drive to Plasma.
The problem with the KIO integration is that it doesn’t show thumbnails and has a “copying” notification and delay when opening any files - using it is a bit overwhelming for him. As you probably can guess, he isn’t very good at computers, so it would be preferable to keep Google Drive instead of moving everything to Nextcloud for now. And we’re trying to find a well-integrated app that does this while offering a smooth experience. He tried Celeste but it has a few errors and doesn’t seem to run in the background once it’s closed.