There are two ways to find scanned receipts in FastBill:
1. If you have already added the data to the receipt in the app, the receipts will be automatically assigned as receipts and you can find them in Incoming invoices.
2. If you only send the picture (without data), the receipts will arrive in your inbox (Documents | Inbox)
Only condition is, that your FastBill account is connected with the app. In the current app version, you can only send receipts to your standard account.