Yes, even if you've generated a manifest for your shipment, you can still reassign it to a different courier partner. Please follow the steps below to learn more:
a) Open the Shiprocket App and navigate to the Shipments section in the bottom bar.
b) Navigate to All Shipments and find your order.
c) Next, go to the top-right corner of your screen and click on the 'more' icon.
d) From the list of options, choose 'Reassign.' You'll be taken to a new page where you can choose another courier partner for your shipment.