Hope to create USB server to store mp4 files, and, run stored MP4

Hope to create USB server to store video files.
1) Hope to create USB server which can work at Korean environment
2) Sandisk, or, you can recommend suitable other USB
3) Router : IPTime ( most popular router in Korea)
4) We do not have experience how to proceed this task.
( Maybe, if we place empty USB in Router, or, pc,
Freelancer can access through Anydesk...
then, create USB Server )
Other possible practical advice from freelancer is required.
5) Confirmation through playing MP4 video file is required.

Thanks for your attention.
Thanks.