[Allen Iverson]

You could make up a lengthy and detailed answer saying you are very privacy focused and they can't ask you to create an account on any social network that is known to steal and collect users data.
Not sure it'd work tho.

The privacy-obsessed guy unable to properly send a working video file... RARE SPECIMEN 
Prob wont hurt to try, although it could just make them even more suspicious & still keep acting stubborn.

I have sent them a corrupt file and they asked me to upload a video to youtube. What can I do?

What's the item? Depending on its nature we might help with creative workarounds.

The item is a keyboard, I’m claiming the keyboard is malfunctioning

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Agreed, don't use silly excuses or methods. It just makes things more obvious.

Are they asking to show the SN in the video?

Didn’t say to show the SN, but I don’t have the keyboard on my hand to make a video