I can't find a video for this double increase so I'm wondering if it has a different name. You purl but don't take stitch off left needle, do a YO and purl into same stitch again and then take off left needle. Does this stitch have a different name?
The videos that pop up are Kfb, m1, etc.
That would not be a "standard" increase so you are unlikley to find a video of it. But, if you know how to purl and you know how to YO, then you can do it.