I'm not a fan of the way QB invoices, and for years prior to using QB, I have my own invoices template. Can I upload these to QB instead of using the built in template?

Hi Matt, thanks for joining the QuickBooks Community

We appreciate you sharing your feedback on the invoice template options in QB Online. The option to upload your own template using Import Style was retired in recent years due to low-usage and the high number of bug reports.

However, we still have some great templates you can make use of when customising your own invoice. If you like, you can also head over to QuickBooks Idea Exchange to share some ideas. We'll be reviewing all ideas submitted here, and if it gets to over 50 votes, we will review it with our Product team. 

Matt this is one of the most requested items on these forums. People have been complaining about it for years. They retired the custom templates because they couldn't make it work properly due to poor implementation by Intuit.

As far as Gorgias suggestion regharding the Ideas forums. It's already been requested, but the issue is it's like a grace yard in that forums section. Due to bad implementation by Intuit. Bit of a running theme with Intuit.