OnePlus 6T can't send video through messages app

uxusk1

    I bought a OnePlus 6T from OnePlus directly, there is no option to send videos through the default messages app. So I press the plus button for more options only image, location, contacts and that's all. I don't see an option to send a video MMS. Online says APN issue I contacted OnePlus and T-Mobile and I resetter my APN but still, there is no option. Please help me fix this issue with my OnePlus 6T.

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