Pick the page before the clip
A good fit starts with what people already watch on that account.
Look through the recent feed
Watch a handful of recent posts on each page you’re considering. Pay attention to what gets covered, how long the edits run and how the captions sound. Look for a format the page returns to often. One unusually popular post gives you less to work with than a format you can recognize across the feed.
Brief the editor for that page
Send a couple of reference posts and say what to take from them. On a football page that posts debates, the edit might build around one match moment and end with a question viewers can answer. A highlights page might suit a quick sequence that lets the play speak for itself.
Before the edit starts, agree on who will publish it and where the logo, captions and sponsorship disclosure will go. The editor can then make those things fit the clip from the first cut.