Sorry - all we know about the video is that it's "4K" and you say it has an alpha channel. If we had more detail, we might be able to isolate the issue.
If you have a look at the attached MediInfo reports, you'll see that the 4 alpha videos are made using different codecs (boxed in blue.
If you don't have MediaInfo, you can get it
here. Please attach the full report from your alpha video.
Did you test the three alpha videos I uploaded? If so, which ones worked?
Again, please post a screenshot of your "About" screen. It should look a bit like this:
Cheers - Tony
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