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  • I know it’s an old question and you’ve probably figured this out by now, at least I hope so, but for anyone else that has a similar question.

    The main problem with the above code is the first line

    $attachment_id = the_field('bild_startseite_boxen');

    the_field() echos the value, when you want to put the value into a variable you must use get_field()

    $attachment_id = get_field('bild_startseite_boxen');