Unable to find files previously downloaded as previews

I would like to point out that when you download the preview videos, no ID or anything similar appears in the file name. This makes it impossible to rely on your website to then find the videos and buy them. In practice, I wasted several days of work to edit a video, and now I don’t have the ability to find the videos that interest me. All files are called the same: “video_preview_h264” or alternatively “watermarked_preview”.
Who is the genius who had the idea of not putting an ID in the file name?