A good example for metadata and privacy that might be applicable to you is photos. Phone cameras attach a ton of useful data to your photos, often including the exact gps coordinates where it was taken. Sharing those files directly with people could potentially leak your home address. Most online photo hosting services (Facebook, imgur, Instagram, Lemmy, etc) strip that data for you but that wouldn’t be the case if you directly emailed it to someone.
Nothing to be super paranoid about but it’s a great example of metadata leaking unintuitive information.