QB Issue Resolution:

Since the issue persists after following the steps shared by my colleagues in this thread, I highly suggest contacting our Phone Support team. They’re able to pull up your account using their screen-sharing (remote access) tool in a secure environment and investigate the cause of this odd behavior. They can also perform other troubleshooting steps to fix this for you.

Here’s how to reach them:

  1. In QuickBooks Online (QBO), click the Help (question mark) icon at the top right.
  2. Select Contact Us at the bottom to connect with our live support.

Just in case, I’ll add this article for future reference: Import custom form styles for invoices or estimates.

Resolution for Issue 'When I get to step three (print preview) while importing my custom invoice, the area where I am supposed to preview is blank. Help??' available: Yes (Solved).
Source: Intuit Community forum.

When I get to step three (print preview) while importing my custom invoice, the area where I am supposed to preview is blank. Help??: 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.

Support for phone support
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Error Recovery for phone support [Canada]
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Additional Support Options: