Most organisations never decided to handle video from many sources. It simply happened. A camera network was already there, then files started arriving by email and portal, then meetings moved onto video, and eventually anything anybody needed to judge turned up as a link in a browser.
The usual response is to solve each route separately, and that is where the gap opens. Different tools answer in different formats, teams learn one and not the others, and material that would have been checked on its usual route goes unchecked because it came by another. Anybody trying to get something past you only has to choose the route with the least attention on it.
The checks below cover those routes and report in the same language. A result from an upload reads like a result from a live call, so a team that has learned one already knows how to read the next, and coverage stops depending on which door the video came through.