I have always struggled with uploading my own videos that I bought, to Lingq and to watch the videos and study the lyrics at the same time. I downloaded the webapp on my phone from Language Reactor. You should really consider to do it similar as they do it. I’m not sure how they do it, but it should be possible for you to do it too. Especially with the combination of a video and Whisper AI that you guys work with. Let me know what you think. 
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Thanks for your feedback. We’ll see what we can do to improve things.