A common problem I run into is downloading videos on the go. Websites online are ad-filled and generally unreliable. Being able to access 4K video downloader remotely would be extremely useful, and I suspect it would be easy to implement.
The easiest way I see it being implemented is an app on Android or iPhone that lets you send a link to 4K Video Downloader that's on a desktop computer at home.
The best way I see users retrieving the video downloaded remotely is by allowing 4K Video Downloader to connect to Dropbox or Google Drive. When a link is sent for download to a computer, after the download is complete, 4K Video Downloader will automatically upload to the connected service.