That's not the impression we want to leave you with, @monotypepressing. 

I'd be glad to help resolve the error, so you'll be able to import the CSV file. I want to make sure the data is in the correct format. 

You'll need to follow the supported CSV template formats:

• 3-column -This format has a Date, Description, and Amount column.
  
• 4 column - This format has a Date, Description, Credit, and Debit column.
  

Once you've decided what format to use, here's how you can import the file:

1. Click Banking, then go to the Banking tab.
2. Click the Update drop-down arrow, then choose File upload.
3. Click Browse, then choose the csv file.
4. Click Next, choose the bank account, then click Next again.
5. Map the fields correctly, then click Next.
6. Choose the transactions you'll import, then click Next.
7. You'll be prompted to import now, click Yes.
8. Click Let's go.

You can add more transaction info, like the category or payee, after you upload them into QuickBooks Online. 

I've also added these articles to bring your PayPal transactions in QuickBooks Online without being connected to QBO Banking:

• Manually upload transactions into QuickBooks Online.
• Sync with PayPal: Manual import overview. 

If you're still getting the same error after 72 hours, I recommend contacting our QuickBooks Online Care Team to pull up your account in a safe environment. They'll be able to further investigate what's causing the issue and resolve it for you. 

Let me know how these go and feel free to leave a comment below if you need anything else. I'll be on lookout for your reply. Have a nice day!