We have all the UPS shipping options available, but they are not showing up during the checkout. We know that UPS provides the 2nd-day option because we can ship using that option on the UPS website. Any thoughts?
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Shopify optimises the services at checkout and provides the best service based on the transit time. However if you are looking for a flexibility to choose 2 day service over UPS ground for guaranteed delivery then you can opt for the Multi carrier shipping label app. It will allow you to get multiple services like UPS Ground, 2 Day, Next day air. In addition, you can forcefully use any shipping option on label generation.