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ACF Pro acf/upload_prefilter not working?

  • Hi all,

    I have a simple form with a file upload and I’m attempting to intercept it with the ‘upload_prefilter’ filter, but it’s just not working!

    My code is as follows:

    function my_acf_upload_prefilter( $errors, $file, $field ) {
        $errors[] = 'computer says no';
        // return
        return $errors;
    add_filter('acf/upload_prefilter/name=unique_upload_image', 'my_acf_upload_prefilter');

    I thought this would just cause the upload to fail for the field named ‘unique_upload_image’ – but it continues to work fine.

    Am I doing something stupid here?


  • OK my bad, I was forgetting my namespacing!!!

    Should have been:
    add_filter('acf/upload_prefilter/name=unique_upload_image', '\App\my_acf_upload_prefilter');

    However, although this now works, it’s still not displaying the error message I defined, it’s just saying ‘HTTP error’?

    Any ideas?

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