Hello there, @kmj74hiab.
You'll have to manually attach the file to any transactions you're creating in QuickBooks Online. There isn't an option to automatically and permanently add them by default.
For more details about approved transactions you can add attachments and supported file documents, check this link: Attachments in QuickBooks Online.
I'll take note of this and prepare a feedback statement directly to our product developers. For now, I encourage visiting our blogs to stay current on all the QuickBooks new and announcements.
Let me know if there's anything else you need by clicking the Reply button. Have a wonderful day!