How do I attach a receipt to a matter when being reimbursed on personal credit card used for a matter expense?

I had to ship a package for a matter using a personal card. I need to enter the expense in the appropriate area, and I don't see the ability to attach the shipping receipt to the expense. Just for clarification purposes, when entering an employee reimbursable expense, I utilize the operating accounting tab and enter a new expense recovery, correct? How is this information pulled into the next payroll cycle? Are there additional steps to notifying payroll that there is a new expense to pay out?