Vendor Portal / Vendor Invoice upload for direct payment

Vendor Portal / Vendor Invoice upload for direct payment

Hi, i have a question about using the Vendor Portal for direct Vendor Invoice payment.

In our case our Vendors ( Trainers ) invoicing us direct for there Traininghours.
What i thought i the Vendors( Trainer ) can upload  ther Actuly Invoixe in the Portal. and  we can aproved it and pay the Invoice directly and convert it as Expense . But i cant do it

Basicaly thsi workflow:
Vendor uoload invoice in the portal - - we check the details -convertthan to expense ---- pay Vendors Invoice

Any Ideas ?

Thanks in advance