Clarifying question on transaction feeds

I may have read this and forgotten it, but after the accounts refresh automatically, are the transactions from those refreshes automatically added to the spreadsheets or just available and then added only after I open the spreadsheet and click, “Update Sheets?”

Not automatic. You do have to open and then update sheets. You can set the Tiller feed to automatic so that, once the sheet is open and you click launch, it will automatically start the update.