S7 Edge Whatsapp Problem (Video attachment)

Hi there,

Can anyone help me in solving this problem? My whatsapp has been acting funny with regard to videos. When I try to attach a video from Whatsapp-->attach-->Gallery, and this video is more than 2 secs, Whatsapp refuses to send that video claiming that I don't have enough space, then guess what, it deletes the video altogether. I can't find it anywhere on my phone!

What could be the reason for that?

P.S. Phone memory has more than 50% free space

Thanks.

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