This could be due reviewing the Company Documents tab rather than Personal Document tab. To view personal documents on the mobile app:
Login to PeopleHR mobile app.
Tap the main menu, then tap the three lines.
Tap View Your Profile then tap Documents.
To use filters to sort by name, category, or date, in the top right, tap the filters,
icon.
If required, tap the Sort by and Sort Direction.
Select the required Filter by Date option.
If required, add a name to filter by then tap Apply Filters