So if you have a video you want to save on thisvjd here are the steps. this applies to both public and private. all that matters is having accese to it. Tested using Chrome other browsers might be different. Thanks to a reddit user with this explanation.
Step 1 before going to the website that plays your video, press F12 (or Options -> Tools -> Developer Tools).
alternatively, you can open the web first, open the developer tools, and the refresh the page.
Step 2 go to the networks tab and sort it by size (large to small)
Step 3 after a while, your video will be the first on the list because it should have the largest size. click on that.
unfortunately, if there are multiple videos on the same website URL, you need to figure out the video you want to download manually..
Step 4 you can see the video URL in the description. copy it and then paste it on another tab.
Step 5 in this tab, you can then right click on the video, and you have the option to save the video.
alternatively, if you are using a download manager software, but for some reason the "grab" feature doesn't work, you can just paste the video URL on that software.
Step 6 enjoy the new video you just downloaded!