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QuickBooks Online (QBO) depends on the information provided by PayPal. Within this context, you'll have to contact PayPal support to check for any issues on their end.
For now, you can manually enter the missing transactions. Follow the steps below on how to proceed:
- Log into your QBO account.
- Navigate to Transactions, and select Chart of accounts.
- Locate your PayPal account.
- Click View Register.
- Then, click the Add check dropdown menu and add the transactions.
Also, please note that the differences between Connect to PayPal and PayPal Bank Feeds rely on transaction handling and imports. See the attached images for details:

Another important consideration is to routinely categorize your uploaded bank transactions to ensure everything is classified accordingly.
Finally, explore QuickBooks Live Expert Assisted for expert guidance on tracking your app transactions. They provide personalized support to help you navigate your financial records and enhance your QuickBooks experience.
You can count on us for any additional assistance when managing PayPal transactions within QBO.