Might be a bit irrelevant to you, but for sensitive information I wouldn’t use iCloud (Google Drive for me since I’m an Android user). I have free unlimited photo storage with Amazon since I’m subscribed to prime, and I have auto backups disabled, and only use it for nonsensitive photos and videos.
Anything I wish to keep private, I store it offline on encrypted external SSDs. When I wanna share it with someone, I use Signal or in some cases Samsung private share.