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I'm using the Postie plugin to receive an email to create a post. In that email there will be link(s) to a pdf. I'm using wp_extract_urls and code from this post to try to add the pdf to the media library and hopefully attach it to the post.

So far I'm able to add an entry to the media library, but it doesn't have any content. Here's what I have so far:

<?php

    $string = the_content();

    $urls = wp_extract_urls( $string );

    $uploaddir = wp_upload_dir();
    $uploadfile = $uploaddir['path'] . '/' . $filename;

    $contents= file_get_contents($urls);
    $savefile = fopen($uploadfile, 'w');
    fwrite($savefile, $contents);
    fclose($savefile);

    $wp_filetype = wp_check_filetype(basename($filename), null );

    $attachment = array(
        'post_mime_type' => $wp_filetype['type'],
        'post_title' => $filename,
        'post_content' => '',
        'post_status' => 'inherit'
    );

    $attach_id = wp_insert_attachment( $attachment, $uploadfile );

    $filenew = get_post( $attach_id );
    $fullsizepath = get_attached_file( $filenew->ID );
    $attach_data = wp_generate_attachment_metadata( $attach_id, $fullsizepath );
    wp_update_attachment_metadata( $attach_id, $attach_data );

    ?>

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