Dragging mp4 files to my timeline sometimes includes audio, othertimes not.

I've noticed over the years that sometimes when I drag mp4 files to my timeline that sometimes there is no audio there, even though there is audio in the mp4 file. 95% of the time I'm  bring in content I recorded with OBS that definitely has both.

Is there something special I can if I specifically don't want audio when I drag a file in? That is, the file has audio, but I only want the video to be on the timeine. What I do now is I drag it in, unlink it, then delete the audio.  The odd thing is that sometimes happens on it's own and I'm wondering if I can make that happen when I want it to