don't close the gap in the timeline when cutting?

I feel you would need to fill(replace) that gap first  Here I opened a video and made two cuts. I then added a new video group and an empty layer into the new video group. I the positioned that layer over the middle video clip the the duration of that clip. I deleted the center video clip and Photoshop closed the gap in the video group. At this point you can either reposition the clip to the right or move the still frame video clip between between the clips. in the original video group.  You can also delete video group 2.  Your video now has a gap with no image and sound.  It would most likely be rendered out as black gap  If you move in the gap you do not hat to reposition the other clip Photoshop automatically does that like it automaticly closed the gap,  If the still frame had an image or a black fill instead of being  empty you would not have to delete the video clip you would have your image or black gap and still have the clip's audio.