Re: Is an attachment to an invoice viewable by the customer?
Hi there, frenchbroadsu. Yes, your customer will be able to see the attachment.
As long as the setting for the Online Delivery section was set to an Online invoice. Your customers will be able to see it. I'll walk you through on how you can set this up:
Go to the Gear icon.
Select Account and Settings under Your Company.
Choose Sales on the left side.
Click the pencil icon in the Online Delivery section.
Click the drop-down arrow under the Additional email options for invoices.
Select Online invoice.
Once done working these steps, you can try sending a test invoice with an attached file to your personal email. This way, we can check if your customer will be able to see it once you send an invoice to them. Consider checking this article in case you're getting delivery errors when sending emails to your customer.
I'm always here to back you up in case you need further help with QuickBooks.