Jobloggs2008 It seems that you didn't receive the replies from the support team.
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Below are the replies from the support team for your convenience:
Passthrough:
Please note that the uploaded video consists of several parts with different variable frame rates (FPS — frames per second).
For the video to be processed correctly, please use any third-party video conversion tool available to you and convert the entire video to one consistent FPS.
After that, you can upload the converted video to Drive again and apply the plugin you need.
We will also add the stable FPS plugin in a future update.
Script AI:
According to our data, the video's frame layout was specified incorrectly (side-by-side instead of mono). Please try changing the video settings and then check to see if the script generation issue persists.