Thanks borate for your response! I have looked at the article but unfortunately as is often the case, steps are missing or no longer exist in the app. Also the frustration of undated internet articles. (maybe very old and refers to back versions?)
However, is there no way of forcing the thumbnail to show in windows explorer during video preparation and export in VideoPad? (The thumbnails inside Videopad are no problem, that's not the issue.)
I am producing tones of short videos to assist a dance studio running virtual studio dance lessons and most videos shows the first frame of the main (longest) clip. . . . I think, (99% an image of the teacher ready to start), but not the first frame of the first clip with student name and lesson details. . . . . and then . . . suddenly randomly , one does!