Vendor not populating in Upload Bills

Thank you for reaching out to the Community, @pjonesmn. I'm here to help you sort this out. 

You have to edit it manually. When you upload bills to QuickBooks Desktop, they'll appear in the For review section. You can update, match, review, or add transactions to the register from here. I'll show you how you do it. 

1. Go to Vendor, then Bills.
2. Select Details.
3. From the For Review tab, click the Refresh icon.
4. From here, you can select the bill or bills if you want, then Batch Actions if multiple bills are selected.
5. Hit Edit to change the Vendor Name, Account, Bank/Card details, or date of all the transactions in one go.
6. Once done, click Save for the info to update your transactions.
7. Choose Delete if you want to permanently remove the bills.

Then if you have an existing bill transactions, you just matches there. On the other hand, QuickBooks Desktop mobile app only scans one receipt for every upload. Thus, you're getting issues when uploading multiple pages of receipts. 

For your reference, check out this article for more detailed information: Upload bills to QuickBooks Desktop Pro Plus, Premier Plus, or Enterprise.

I'm also adding this resource that contains the steps on how to settle your payables in QuickBooks Desktop for future reference: Pay bills in QuickBooks Desktop.

Let me know if you need more help in managing your vendor transactions. It's always my pleasure to help you out.