How do I upload a tax return and e-file it through QB Online?

Welcome to the Community, @snagy1953. I'll guide you through filing your tax return in QuickBooks Online (QBO). 

QuickBooks is capable of paying and filing your payroll tax forms electronically. However, there's no way we can upload the documents you downloaded and corrected back to your QuickBooks company. Thus, I recommend filing this directly to the IRS and documenting it in the application to keep your records accurate.

You can follow these steps once you are done filing your tax return manually to the IRS:

1. Go to the Payroll menu and select the Payroll Tax tab.
2. From there, navigate to the Filings section and locate the form you want to mark as filed.
3. Click the form, hit the Record filing button, and then Done.

Moving forward, you can configure your company file's setting to start paying and filing your tax forms electronically. To do so, please visit this article for complete guidelines: Pay and file payroll taxes and forms electronically in QuickBooks Online Payroll.

I'll keep an eye on this thread if you acquire additional assistance with filings or any payroll concerns. I'm just a post away to help you. Take care!