But this one sounded rather different so I sat up and watched and listened. This was an amplified version and I noticed that it had five strings as opposed to the usual four strings. The unusual arrangement of the strings can be seen clearly in the first video below. The player was Taimane Gardner and she was very good, excellent in fact.
This clip of Taimane is one of the "Top 10 Ukulele Moments" selected by Guitar World magazine last year:
and I didn't know about the instrument's Portuguese (and Brazilian) connections...