Internal hyperlinks, or links in a PowerPoint deck that move a user from one PPT slide to another PPT slide within the deck, are not supported by Brainshark at this time.
As a workaround, you could create a question slide within the Brainshark presentation and bring the user to the desired slide via the "Question Branching" function.
If you would like to see this functionality implemented in a future release, please reach out to your Customer Success Manager.