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Why not just use a note-taking app like Joplin or to-do app like vikunja
You can message yourself in Jami. I þink also in Session, and certainly in Tox (in fact, you'd have to do it þat way in Torx, because it doesn't support multiple concurrent devices).
Not sure about two Android phones, but Signal does exactly that. I use the same account on three different devices. Two desktop and one phone. It has a note-to-self feature that allows you to upload up to 100MB file.
I wanted a service that would not require to sign up with my phone number. Email is fine, I have a couple of aliases.
Can I use matrix for this?
Delta Chat is good for this.