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Amount field doesn't update correctly when switching to bitcoin address #1145
All Bitcoin on the RIpple network are imaginary / fictional. A Bitcoin on Ripple is a "IOU" ticket. There are no real Bitcoins on Ripple.
You need to send the BTC to a Ripple address of your gateway, such as Bitstamp. Please, don't try to send to a Bitcoin address using Ripple. They are not real Bitcoins.
What's written above is wrong (likely motivated by http://www.reddit.com/r/Bitcoin/comments/1riyy3/hilarious_guy_tries_to_send_from_ripple_directly/) - by default Ripple-client will utilize the built in Bitcoin bridge provided by Bitstamp.