I created a new folder, created a text file in the folder, and added some text to the file. The name of the folder, the text file, and the content itself were sent to the server unencrypted (besides TLS).
I'm sure your server encrypts the data immediately, but this adds unnecessary trust when client-side encryption could be employed. It also enables an attacker or a potential future operator to sniff the data before it is encrypted. That's no good!