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I cannot add or select a video with any extension in this program. I don’t know what the problem is, can you help me?

GigaPixel AI does not work on videos, for that you need Topaz Video AI.

Go to the main website and raise a support request as we are all users here.

You will see a blue callout on the bottom right of the page, click on that and Ask.

Hi! Not a user here, I work for Topaz Labs.

@AiDon is correct, though. You will want to reach out to support for a refund, so you can purchase the correct product.