To download a twitter video you should do steps below.
If you are in app or twitter website, click on the share icon below the video player and select "copy link to tweet" or "copy". The sharing option is usually below the video on the right.
Paste your twitter video url into video address field and click download button. You can paste url with Ctrl+C or hold on the field and click on paste option.
You will get a list of video file for download.The list contains some video qualities. By click on the download link of your custom quality then download proccess will start.
Vidiget twitter downloader is a fast and powerful tool for downloading Twitter videos. Download Twitter videos easily with just three clicks. Copy the video URL and enter it in the URL field at the top of this page then click the download button. A list of video files is displayed for you. You can select the desired quality and download it.