Filter by multiple categories

  • Hello,
    in my wp search I want to filter posts by category.
    These posts are made with WPDM Pro (WordPress download manager).
    At the moment my query string looks like this:
    ?s=searchstring&post_type=wpdmpro&wpdmcategory=cat1,cat2
    But when I seperate the categories by a comma it is cat1 or cat2 but I want to find posts that are in cat1 AND cat2.
    How can I solve this problem?

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