To add a video for Marco Uccellini / Sonata Vigesima Prima (21) for 2 violins & continuo (from Op. 4), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Marco Uccellini / Sonata Vigesima Prima (21) for 2 violins & continuo (from Op. 4)