So I have $4500 in bitcoin on coinbase pro and trying to sell when it gets to $4100 which is considered a stop order, correct?  I put the stop price at $4100 which automatically fills in the limit price but not the "amount" box with btc.  I try to place an order but it gives me an error then I click the max link, a btc amount is shown but the total at the bottom says "1,886.18 USD" with a fee of "$9.48?"

Can you please advise on how I correctly fulfill a stop order?