thumbnail in new yt version

[The Rose]

please help I cant save the thumbnail I want (1 out of 3)
yt always chooses the second image and I cant change it
this is in the new yt version . how do I change the thumbnail?

 

[Simon Johnson]

youtube has a slight delay on the changing of your thumbnail.
in video manager, make sure you've clicked on which ever thumbnail you want, and save the changes
It won't be instant just wait a couple hours and it should have worked.