Astral Send - Help:

There are three options for sending documents using Astral Send. You can send documents individually, in a batch and schedule documents to be sent in the future.

In the search bar enter “Posted Sales Invoices” and select it from the list:

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Figure 1 | Business Central Search - Posted Sales Invoices

On the Posted Sales Invoices list page, click on the “Search” box, enter the invoice number you want to send (1), select that invoice line (2), click on “Process” (3) and select “Astral Send” (4):

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Figure 2 | Posted Sales Invoices List Page

The customer will receive an email with the invoice attached as a PDF document.