QB Issue Resolution:

QuickBooks Mac 2014 has attachments, which are what you want. Its the paper clip icon on the top left of the invoice and other forms. You can add PDFs, scans, images, word docs, whatever you like. These are copied into a directory you specify in the preferences. They are also OCR scanned and you can add keywords. I think this was in 2013, too.

Resolution for Issue 'How do I import a pdf into quickbooks and associate this pdf with an invoice? How about OCR also?' available: Yes (Solved).
Source: Intuit Community forum.

How do I import a pdf into quickbooks and associate this pdf with an invoice? How about OCR also?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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