We update our banks manually. We connect to the bank 3 times a day and get only the new movements, save them to a file and then we try to import this file to our Zoho bank account. First time is OK (10am) but when we try to import new movements between 10am and 2pm we get an error "A statement has already been imported for these dates. Please check and try again". We need a third import at 5pm.
Maybe you can set a swith in configuration to turn ON/OFF this option.