XnView Software

I've saved some videos to a folder using XnView import function; however, when I go to the folder in XnView, nothing shows up in the browser window. The videos are all there on the drive when I look in Windows File Explorer, but there's nothing to see in XnView. (The files are all mp4.)

I think I should be able to view the files and even play them in XnView MP. Is that right? If so, I'd be grateful if someone could tell me what I've done wrong.

Have a look at: Settings > Filelist > Custom Filter
There you can configure which file types, thumbnails and previews you want to be shown.
The "filter" in the main window toolbar has to be set to "all" or "video" as well.

Thank you Friedrich. It was the filter in the main window toolbar that I'd not set to video. All good now