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I have a OnePlus 6t with international firmware flashed on a t-mobile variant. but I've never had any problem sending video with a stock app. However I no longer use the stock app for messaging. I use Android messages. It could be an app issue so you might want to try another app just for comparison sake.
Wow, that's pretty odd. Are you able to use another app as mentioned above? It'll be a good way to test to see if this is a settings issue or an issue with the pre-installed messaging app. Please let us know.
We'd love to help work out the issues with your OnePlus 6T so that you're able to send videos. As others have mentioned, try using a different messaging app to see if the functionality is there and report back.
Just checking in to see if you've had a chance to try another messaging app.