How do I now save .mts video files to from an SD card to my internal memory?

Before the PIE update I could plug in an adapter into my USB port, stick in my SD cards from my Sony camera and easily play those .mts files through Video Player. That still works. But I can no longer copy/move .mts video files from my external SD card to my internal phone storage. What the hell?! Worked FLAWLESSLY before this update

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