Jai Shri Krishna!🙏
If you are unable to attach a large video file of 12th or 15th chapter, you can send it as document in Whatsapp from your mobile phone.
Below is a link of demo video on How to Send Large Video as Document using Android Phone - 👇
https://www.youtube.com/watch?embed=no&v=CuTMJf17RIs
» Demo Videos for Participants