The below explanation is copied from the FAQ page on Morphy Auctions website:

How are pre-bids executed and how does Live online bidding work?

On the day of the auction, if you left pre-bidsonline, these are transferred to the auctioneer fifteen minutes before the auction begins. Our online platforms close for absentee bids and open for live onlinebidding and to our auction floor. Morphy Auctions utilizes multiple bidding platforms, of which, our primary bidding platform is MorphyLive.
Live auction floor bidderstake precedence, and win any tie bids against the internet. Our auctioneer takes these floor biddersfirst then checks his computer for your bids. Because this is a live auction, we do not offerBuy Now offers due to the agreement with our consignors.

Phone lines are limited, so please arrange a phone line at least 24 hours prior to the auction. As a phone bidder, your bids will take precedence over internet or absentee bids in a tie bid situation. During your phone bid you will hear the auction and the timing of the sale (the auctioneer does approximately 80 100 lots per hour).