To add a video for Leonhard Schmidinger / Victimae paschali laudes (for Proprium Missae in Ascensione Domini), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Leonhard Schmidinger / Victimae paschali laudes (for Proprium Missae in Ascensione Domini)