To add an additional receipt to an expense on the web portal follow these steps:

1. Go to your My Expenses area and click Draft.

2. Click on the expense, then click Edit.

3. Click Add an additional receipt, which can be found underneath your receipt image.

4. Click Choose a Receipt.

5. Click Choose an Existing Receipt to pick a receipt that has already been uploaded to your account, or click Browse Computer to pick a receipt that is stored on your computer.

6. Select the receipt you would like to also attach to the expense from the list. 

7. Once you have attached the receipt, click Update to save the changes to your expense.