Hi there, lrades.

I'm here to guide you to the right support so you can get the help you need. 

Good to know that you have the latest version of QuickBooks Desktop for Mac. Since you're importing an invoice file using a third party application, I encourage you to give them a call. They have the tools to check what causing this issue and guide with the process on how you can import the file from your the third party app to QuickBooks Mac successfully. 

Please know that you're always welcome to post again if you have any other questions. Have a good one.