You have already searched within the route recorded by the IVMS, usually when you take a photo with the IVMS or a video, it goes to the root folder of the IVMS
c: Ivms4200 -> capture-> Image capture date
Likewise, it generates a folder when you give the video .. I hope you can locate your folder. Another option is that when you click on the Image Capture of the IVMS, it will send you the path from where the image will be saved.
route
Thumbnail view
Regards. I hope it serves you