While Content Authors now have the ability to upload HTML5 content, we do not support merging presentations created with HTML5 content.
Please refer to our Product Release Notes from October 27,2018 for further information.
If you would like to request this functionality, please visit 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).
In our Product Suggestion forum, you can submit requests and vote on suggestions other Brainshark users have made, as well as subscribe to them for updates. This lets our product team know what features users would like to see in the future.
If you need additional assistance, please contact Support.