I've got some instructions to provide on what is the best thing to do if transactions are not showing up 2020 in QuickBooks Online. Let's run a manual update to ensure your bank transactions are up to date.
Here's how:
1. Go to Gear icon.
2. Choose Bank Account.
3. Click Refresh On.
This process will restore the bank connection and will trigger the updates to your bank transactions.
If the issue persists, I suggest trying the following steps: