Cryptee

Cryptee is a cross-platform, zero-knowledge, client-side AES256 encrypted, Documents and Photos application/service. It's meant as a secure and private alternative for Evernote/Bearnote & Google / Amazon Photos.

Your data is for your eyes only. Your documents, notes, photos, and files are all encrypted using AES-256 before leaving your devices.

Anonymous Registry - All you need is a username. We do not require you to provide any personal identifiers, like an email address or phone number, to create an account with us.

Protect your data from unfriendly eyes with our unique Ghost Folders feature. Even if someone asks you to log in to your account in front of them, your most sensitive files will remain hidden. Plus, we don't require you to download any apps, so nobody will know you use Cryptee by looking at your app download history.

We are based in Estonia, named "the most advanced digital society in the world" by Wired, and a country where the government runs on blockchain. Because Estonia is outside of the 14-eyes countries, we have greater protection from mass surveillance and corporate espionage.
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Cryptee is a new service, but one that I think has a lot of potential. The initial free account only provides 100MB of storage, but that is enough to check out the service and see if it meets your data storage needs.

I note also that 100MB is more than enough to exchange messages with someone using a shared password (foldering).