You will need to take a snapshot in videopad, save it, and add it back to the timeline?
Drag your cursor to the position in your timeline where you want to take your snapshot.
Right-click and select the option from the dropdown menu that says “Take Snapshot of Clip”.
Choose the size and resolution of your extracted image.
Your photo will appear under the images tab in the media bin.
Drag the image into your timeline to use as a still photo in your video.
Source: https://nchsoftware.blogspot.com/2019/02/how-to-make-freeze-frame-of-video-clip.html?m=1
From the Journal of Adrian Lee – https://adrianvideoimage.com/