Please watch: "HOME SHARING ON CATALINA MACOS"
https://www.youtube.com/watch?v=fz5Af86nNSM --~--
CONVERT A MOV FILE TO A MP4 2019

MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet.