Hello, @RbDev
I just tried to reproduce this on my end using the following environment:
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Mattermost Server 5.23.0
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Mattermost iOS mobile app 1.31.2
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iOS 13.5.1
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iPhone X
I can confirm that the photo taken was rotated correctly based on the screen shots below:
Maybe you can share the exact steps you performed on your end? Also, can you confirm on the environment you are on as well?