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Close should be inside the loop. Before you start a new file you would close the old one. The file reference you get from opening the file would be put onto a shift register so that you can access it in the next iteration of the while loop. Can you share your code?

You are likely getting only 1 video because you are re-using the same filename. There are a bunch of ways to solve your problem. For me the easiest would be to look to using an Event Structure as this stops you from needing to poll the button all the time. Do a bit of googling to see how the Event Structure works. (tip, you will configure an event that responds to the save button click, and in that event you will prompt for a new filename (or autogenerate with timestamp) and then open a reference to this new file).