Is there any means to force an update for a linked, external checking account?
Yes, there is. Navigate to External Accounts > Settings (on your financial institution in question) > Refresh Accounts. That will manually for a refresh as you’ve requested. Note that it will take a little while for the transactions to appear. Give it 30 minutes or an hours and refresh the transaction page if they haven’t shown up by then. Furthermore, the External Accounts page will let you know the most recent transactions available from that financial institution (ig. “updated 2 days ago”) which is helpful.
Hope this helps.
Thanks so much, Graham!