whosyourdaty Here is Meta's walkthrough on how to transfer files (in this case videos) to your Quest 2.
The "DCIM folder" mentioned by @adinihsan is actually a folder that exists on your Quest 2, not your laptop, which is why you don't see it. When you've connected your headset to your laptop and given it permission to connect (instructions in the link above), you'll have access to headset's folders via File Explorer on your laptop, and you can then move videos over from your laptop to the DCIM folder of your headset.
But the above link walks through everything step-by-step, so please take a look!