I would also nudge a bit towards Cryptomator too. Since it has a GUI, and is a bit easier to use than Rclone crypt. I do think you need the official provider sync tool to use with Cryptomator. You also need to download/sync your files locally before you can decrypt. With Rclone, encryption/decryption is done on the fly.

You also don’t need the official sync tool from your provider with Rclone.…