For some reason you can’t use custom skin at Character Creator in iOS Devices. This bug exist since first release version of Minecraft Preview.
There is no possible way to get custom skin.
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Cleaning up old tickets: This ticket has not been updated recently (~6 months+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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This bug affects all platforms. Not just iOS