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Thanks for dropping by, I'm happy to help. You can attach files on your invoices with a maximum file size of 20MB. Also, there are a few file types accepted in QuickBooks. These include:
Also, before sending your invoices, you'll first need to tick on the Attach to email checkbox. It's possible that you sent the invoice directly to your customer.
Here's how you can make sure you're attaching the file before sending:
I've provided a screenshot below of a sample file attached to an invoice.
I'm also including a few very helpful articles for you moving forward:
If you have any other questions, please don't hesitate to post below. Thank you and have a lovely day.