There will be cases where the work order content has to be reviewed before creating and sending the invoice to your customer regardless of the work order being marked as completed. Using the Manually Invoice option can allow this.

From the Billing tab in the Work Order select the option Manually Invoice enter the details for the Series and save changes.
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The work orders will now display Manually Invoice
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Once the work order is set as status Complete through the account or through the Fieldwork office app, no invoice will be generated/emailed to the customer until the "Create Invoice" button is clicked (according to account/setup settings).

Note:
Clicking the button will create the invoice right away without any prompt.
The invoice and work order numbers will not match.

Note:

If a work order is completed, with no invoice created and then the Series is updated to For Every Work Order, the create button will be no longer displayed for that work order, unless series billing frequency is returned to Manually Invoice