I feel you, but Drive is borderline useless and I can't sell any potential users on "you put all your data here but documents go there (but it still looks like you could put other stuff here but that's an illusion) unless you manually export them and then everything gets weird" - I'll count myself lucky if I can finish the sentence before they renew their existing cloud service.
Drive might be 'useless' to you in it's form because you want more from CryptPad (more features in it, more local sync, more anything), but it is very useful to organize your docs that you work on in CryptPad. It also allows shared folders and so on.
What's interesting is that surveying our users did not show local sync as hugely demanded. Mobile access comes up the highest.
