FAQ: Expensify is taking up so much space on my phone! What's the deal?
Expensify reports/expenses themselves do not take up space. We're a cloud based app, so the data is attached to your account and not your device. What does take up space is any cached information that may be stored in your app.
Cached information (such as common merchants or sign-in information) can be the reason for the high amount of "storage". If you are using an iPhone, it could be a bit harder to clear this cached data. You would need to first sync your app (under the Account tab in the mobile app) and then delete and re-install.
You can also occasionally log out/in to help clear that stored cached information more frequently.