You can share the Sales Invoice by either:
1) Whatsapp
At Sales Invoice page, you can see the Whatsapp button. The button will only appear if the Customer has mobile phone number saved in Contact info.
2) Email
At Sales Invoice page, you can click the Email button and enter the email address. Click Send.
2) Share the link
Click Option dropdown menu at Sales Invoice page. Find Share Link. Click and it will display the link. You can copy the link and share the link with anyone you like. It will bring the viewer to the online Sales Invoice page.