How to Add a PDF Attachment to a Sales Invoice
Activating the Feature
Go to Settings
Select Available Features
Enable the setting: Invoice Attachments (PDF files only)
Adding an Attachment to a Sales Invoice
Go to Sales → Invoices
Create a New Invoice
Select the Attachments section
Click Choose File, locate the PDF file on your computer, and upload it
Click Add Attachment to Invoice
Important Notes
You can add up to 10 attachments per invoice
The recommended total size of attachments is under 1 MB