To add a video for Ingfried Hoffmann / Adagio for piano & string quartet (after the 2nd movement of Mendelssohns Piano Concerto No. 2), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Ingfried Hoffmann / Adagio for piano & string quartet (after the 2nd movement of Mendelssohns Piano Concerto No. 2)