The app shows documents from - this is a default setting.
Change the date range and you will see more documents.
Documents from last year
The date filter is in the upper row in your invoice list and says This year or This month
Change the filter to a broader time range to see all your invoices (e.g. Lifetime or Last year)
Tax year (fiscal year, financial year)
Also, check your fiscal year start. The beginning of your fiscal year may not include the current date range. Check the settings at Settings - VAT settings - Tax year begins
Another team member
If you're another team member invited to join a Billdu account, please make sure you have the correct user rights. Users set as "Employee" will only see documents created by themselves.
Make sure you're logged in with a correct email address. It may happen that you've created another account thus having more accounts at Billdu with different data sets.