Hi Manmohan.
Case 00336031 has been raised, should you need to contact us.
Are you referring to ActivInspire and attaching video files within this software?
If so, this can be easily done by clicking on "Insert" followed by "Media" when in media, browse to the section which has the video file and select this and click open. This will insert the video file in ActivInspire. You can also use this to insert audio files.
Apologies If you are referring to something else, if this is the case please could you provide more information on where you are trying to attach a video file?
I hope this information helps.
Adam
Promethean Technical Support