You’re probably getting suggestions for what she should do different because, at least at a starting point, it could just as easily be something her phone is doing before sending as it is something your phone is doing on the receiving end.
I’ve had a phone say ‘video to big, do you want to crop or share through abc app’ before. Don’t recall the exact message, but seems more likely than you phone downgrading something it’s receiving.
The problem with that is that, being on the reasonable side, if we just assume the obvious and then are somehow ‘proven’ wrong on a specific topic (there are thousands of them, so it’s bound to happen sometime) we legitimately lose actual credibility in the eyes of people who matter.
Like the ‘they’re eating the dogs!’ things. It’s perfectly reasonable to mock him for it being an issue, but insisting it has never happened and that even the idea is ridiculous, opens the entire side to being wrong if even one crazy or oblivious person of color has ever done it, which it almost certainly has. I mean if you look hard enough, you could probably find a crazy example of that from any cultural group. One example and pretty much all the mocking gets flipped around in the minds of anyone only half paying attention, and certainly from the other side next time we insist something doesn’t happen.