Allow only one taxonomy?

  • I have a CPT called “multimedia.”

    It’s used to display posts that just consist of some type of media, such as photo galleries, videos, or audio.

    I have a meta field (using ACF) that I use to select the type of content (photo/video/audio).

    I need to make archive templates, and I 3 different templates for the different media types (photo/video/audio). I want to create a taxonomy called “type”, and then each “type” can have its own archive template.

    The problem is I believe by default WordPress will let users select any number of taxonomies.

    How do I limit users to only selecting a single taxonomy?

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