Custom skins do not appear to someone else

duplicate

In Settings > Profile, do you have "Only Allow Trusted Skins" disabled?

Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.

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What OcelotOnesie said worked, so you can mark this as Resolved instead of Incomplete, I just forgot to answer at the time.