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This is what I suspected. There were issues with iPhone photo rotation being incorrect after upload so you had to do it manually. I think this is because the EXIF data was missing.

I think people on this thread are confusing uploading in the browser with uploading via the Facebook app

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To be clear, exif data was still present when uploaded (including the orientation data) but the GPS location had been removed. I think problems with photos being incorrectly orientated is more to do with the website not correctly interpreting (or completely ignoring) the relevant exif data.

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