[RSS Feed/News] Custom Thread Feld combine dropdown selection with text field

[XenForo]

I want users to make a selection either from preset options for choice files OR a text box as a kind of "Other, please specify" field.

I could do this with two fields (one dropdown and one text), but only if neither were required because I want to require the user to either choose drop down or write what they want - but must be one or the other.

Does anyone know how I could achieve this?

Thanks

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