Well the only way I can think of would be to take the video, make a copy and edit just want you want to see. Put that clip in a container field on the portal row. Seems very labor intensive
Have a table of ClipDescriptions. Have a table of Videos. Create a Many-to-one relationship between the Clips and the Videos table.
In the videos table create a container field for the video itself. You can optimise its interaction in various ways. But you do not need to duplicate the video - only store it once (in the video table) and even then only store it 'By Reference', so it is not even in the Filemaker file.
You can create a script and/or a link in the portal to play the clip if you want.
Thanks for that. That makes sense as a good framework to start with. I'll give it a go.