Unable to add categroy attribute to existing custom post type

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Hi, I used the plugin to create a custom post type a year ago. At the time I did not enable support for categories taxonomy. Now when I go back into the plugin and check categories and then update, It does not save it as checked and reverts back to unchecked and categories do not show.

How can I fix this?

Thanks for your help

• This topic was modified 6 minutes ago by NaamaGold.