There is already a section created Called Expense when there is an attachment. Simply add the Expense Detail to that tile, or create a new tile all together. I know that the information is accessible via database, but users and auditors don't need to be trained on how to access that information in necessary. Also, I would like to see some kind of reporting or exporting where the expense detail information is available (similar to "notes").

Yes, please! There are multiple fields missing in invoice review window - also number of miles (or any items) and date of each expense. It would be very helpful to have that info transfer into AP invoice from invoice request!