Thanks for posting to the forums!
My Media is not currently supported through the SlingPlayer for iPad application or the SlingPlayer for Android tablets application. However, it is available through the SlingPlayer for iPhone and SlingPlayer for Android phones applications.
For more information about My Media compatibility, please see this article:
Let us know if you have any other questions.
Sling Media Moderation Team
Here is the latest information concerning the My Media feature for the Slingbox 500:
In a nutshell, the My Media feature was not used enough to justify the costs of keeping the feature in the Slingbox 500.
Hope this clears things up!