I have been tracking my expenses for last 5 years. Almost everything has been accounted for. I made an app to make it easier to do that.
I'm not a fan of giving access to apps like Mint and YNAB was complicated for what I wanted. I manually enter my data in the app and it optionally backs up data to my Google Drive in a Sheet.
https://play.google.com/store/apps/details?id=com.ramitsuri....