klaff

I feel like I'm missing something obvious about the user interface. I'm using a Digital Discovery and WF3.18.1 and am trying to capture a fairly long chunk of data. I have it set to 32MiB samples at 20 MHz (so about 1.67 seconds of data). It triggers fine and I get a trace with the trigger centered. If I set the position to 5 division or some positive time and hit the record button again, the position resets to zero and I get another batch of data centered on the trigger location. What's the obvious thing I'm missing? Thanks!