Where is local data stored?

I’m having an issue uploading data from an old version of Android (5). It says there are incomplete entries that need to be checked before uploading, however when I try to open them to edit it gets stuck ‘loading entry’ indefinitely. Where is the data stored on my phone? If I can access it without the app I could upload/re-enter it manually from another device.

Please read the User Guide about incomplete entries →

Data are stored in the app private folder, which is not user accessible.