At what point can you name your capture file?

New to Intensity Shuttle, but I'm used to naming my capture file in advance of the capture. Intensity
Has "untitled 01" there and though I try to change it, it doesn't accept any changes, but just says "do you want to overwrite Untitled 01?" I don't want it to overwrite Untitled 01 but if I say yes, it still won't let me type in a new file name. When will it let me name my new capture file?
Has "untitled 01" there and though I try to change it, it doesn't accept any changes, but just says "do you want to overwrite Untitled 01?" I don't want it to overwrite Untitled 01 but if I say yes, it still won't let me type in a new file name. When will it let me name my new capture file?