Yes, you can add a PDF attachment while creating an expense. To add an attachment, you need to follow the below steps.

1. Click on the '+' sign to record an expense.
2. Below the payment type, there is an 'add attachment' option.
3. Clicking on the attachment option, you must select the file you need to add.
4. Click open to add an attachment. 
5. Click on save for recording an expense with an attachment.