If I do a "copy & trim media with project" which contains nested projects, will the media files for each nested project be saved along with the media files for the master project, or do I need to save the media files for each individual nested project separately? TIA for your answer!
No. You must save each project with media.
This is the purpose of the Save All feature in Ultimate S 3.0, it allows you do save all nested with one click.