The following article provides similar steps. There are differences between ProxySG and Web Security Service policies.

Allowing a single YouTube video through a ProxySG (KB3710)
https://na32.salesforce.com/articles/Solution/AllowingasingleYouTubevideothroughaProxySG?popup=true
 

Currently, the YouTube URL algorithm contains a unique video ID (for example: tTwddwEceIg) to retrieve videos. This allows Cloud policy to identify and configure that particular video to be allowed.

NOTE: The steps described in this article were tested at the publishing time of this article. YouTube might change its video algorithms at any time.


 

1. Log on to https://portal.threatpulse.com/ with your credentials.
2. Select Solutions > Content Filtering > Policy.
3. Create the first rule in Group A:
   • Who - Anyone
   • From Where - Anywhere
   • To Where - URL:
     • c.youtube.com
     • googlevideo.com
     • ytimg.com
     • https://www.youtube.com/watch?v=tTwddwEceIg (example)
   • What - Anything
   • When - Always
   • Limits - No limits
   • Verdict - Allow
4. Create the second rule below that first rule:
   • Who - Anyone
   • From Where - Anywhere
   • To Where - Audio/Video Clips; etc
   • What - Anything
   • When - Always
   • Limits - No limits
   • Verdict - Block
5. Click Activate.
6. Test.