You can not not share a You Tube inside an Adobe Connect meeting room and have consistently, reliable results. 

Two options are:

  1. You can use the Web Links pod to force attendees’ browsers to open a designated URL. 
    Here's how:

  2. You will need to convert the YouTube to an MP4, then upload the MP4 file to a Share pod and play the file.

    To successfully convert a YouTube video and a MP4 so that it can be played AND recorded inside an Adobe Connect Meeting Room, go to, Install the Free YouTube Downloader program.