[bvrlt]

You should check Genius Scan (for iOS and Android) that does that for you automatically, and much more: https://www.thegrizzlylabs.com/genius-scan/

It also doesn't tie you to a specific ecosystem.

Disclaimer: I'm on of the authors of Genius Scan :)

[gravypod]

There are many solutions for systems like this. Unfortunately none are open source.

Most documents I do want to keep record of are sensitive. I don't trust a closed-source app with that kind of information.