Cant add mp4 videos to itunes anymore
I have been adding my mp4 videos to iTunes fine all day by dragging and dropping them to iTunes. They were then going to home videos so I moved them to movies. Now when I try and add more video files they aren't appearing anywhere in the library not in movies or home videos. I have not changed any settings on the laptop or iTunes and am using up to date versions of both. I don't get why it was working one minute and now it's stopped all of a sudden.
Any help would be greatly appreciated
Thanks
Dave
Toshiba laptop-OTHER, Windows 10, Windows 10 and latest iTunes being