[laurent123456]

There would be extra complexity for sure, especially with key management, but I don't think it would affect sync much. It's end-to-end so by definition it should only happen client-side, and instead of sending plaintext to the cloud your send the ciphertext.

[NayamAmarshe]

Yep, it's a good challenge too. I'm not giving up on the idea of E2EE, of course. Just trying to find ways to do it so that there are no compromises with usability.