Currently, PowerPoint transitions are not supported in Brainshark and will not appear in the Brainshark player when viewing your presentation.
If you would like to request this functionality, I recommend visiting our Product Suggestion forum.
To access the Product Suggestion forum, please sign into your Brainshark account and select "Product Suggestions" from the drop-down menu in the top right corner. This will automatically create an account for you if you don't already have one (and if you do, you will be signed in automatically).
If you need additional assistance, please contact Support.