Cameras record orientation in metadata instead of rotating the actual pixels. Viewers that read that flag show the photo correctly; those that ignore it show it sideways. Rotating the image pixels bakes the correct orientation into the file so it displays right everywhere.
Open the downloaded file in a different viewer than the one you took it with - a browser or a messaging app preview. If it is upright there, it is upright for everyone.
If a whole PDF has rotated pages, use Rotate PDF instead - it fixes orientation page by page inside the document.
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