HELP PLS! How to stich together 2 half vids in animate

So i was doing some last minute polishing on a big project ive been working on for a long time  and after rendering the vid I noticed a few minor bits in the first scene needed a touch up, but aniamte froze during the second render and crashed. The fla file is now broken and won't open and the last alt copy I have is from yesterday before i spent 3 hrs polishing it. The first scene is all that needs to change and only in a minor way. Is there a way to render the first scene then stitch it onto the already finished second scene?