Emmanuel Katto | How to add thumbnail in PeerTube?

Hello, my name is Emmanuel Katto and I am from Uganda. I am uploading a video in PeerTube but unable to add a thumbnail, any help would be appreciated.

Anyone there to help??

Can you be more specific?

Is it because you don’t find how to do?

Or have you an error message? If so, can you tell us on which Peertube instance, and copy the error message? (or make a screenshot)