Filter the project or customer in Reporting, Expenses, check the receipts, and export CSV or Excel to invoice from. The receipt photos stay on the project.
Because each expense is filed against the project, the costs for a client's job are already together. Open the project's Expenses view, or Reporting, Expenses filtered to that customer, to see what was spent.
Before you recharge, check any expense flagged as a mismatch: it means the lines read from the receipt do not add up to its total. The receipt photograph sits beside the lines so you can correct it.
Then export CSV or Excel and raise the invoice in your accounts package. SiteSurvey does not create invoices itself. The receipt photos stay in the project's Files tab if the client asks for evidence.