Yeah, you have to reset the release button "trigger". Once shot, push the button all the way in until you hear a click, then it should spring back to the full position, ready to be filled. If it is sticky, like with mine, just whack it a bunch until the button pops back to the normal position.
I use a soft plastic head screwdriver to do this, screwdriver to push the button in till click, then a tap with the soft plastic to get the button to come back out from the click reset position.
Best of luck,
-Daes
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