I tried multiple video downloader, but Surfast is the most complete in features. It allows me to download, trip my files, create clips, and this is so valuable for the content I create. I love that I can within the app browse the internet and download the video and audio that I want to archive.
Special kudos to their support team. they are so responsive to issues and provide top notch support when you have a problem. The updates are quick compared to other similar apps.