Thank you for writing.
Please note that the allowed attachments in a forum are: gif, .jpg, .jpeg, .png and this is why you could not attach your video.
We will appreciate it if you open a support ticket and send us a sample demo project and a video that demonstrates the undesired behavior. Once we are able to replicate it we will look for the best solution for it.
I am looking forward to your support ticket.
the Telerik team