Issue with notification tab

I can't drop-down notification panel while am playing videos using any of the apps(YouTube,mx player etc).
Also am not able to send what's app message directly from notification panel without opening whatsapp (that's not an issue of what's app)
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Please specify your device details
Hi, kindly help us with the following information to find a solution to your query.
1. Name of the Asus device you are using.
2. Firmware version your device is on.
3. Elaborate more on your concern using a small video of the issue so that we can help you better.
My phone update not received in July update