The software does not let you copy and paste the text. When you paste in the text it does not save it.
I had a basic project with two videos and two different sequences. I created a transcript and captions on the first video. Then I imported the 2nd version and did the same with that one. At first, it would not export the .srt file for the 2nd video, but once it did, it had actually exported the caption file from the first video.