This device will convert analogue video from a video camera or video player or any analogue source to MP4 video onto a USB stick

An OTG cable with micro USB and USB-C to allow you to upload the video to the phone/internet is also available here:-
https://borrow.libraryofstuff.co.uk/product/1257

This can all be done without a PC.
Its best done in small clips as the device has a habit of disconnecting sometimes without warning.

Attach a video camera, attach a TV, then click record! Its that simple.