I’ve just manually checked this for you and it’s not currently picking up any files.
Can you confirm how the folder structure looks that you have in place please? It should be similar to this:
Dropbox/Apps/Quick File Receipts/6131501532_OptionalName/
If you have only the only account, you don’t even need the folder with the account number, and you can simply save your files in
/Quick File Receipts/