plugin-contact-form-7

You need to use JS script that will double the value of your fake URL field and real URL field of the form in the pop-up. Sure you may use jQuery for it as well. Try this answer by Richard Dalton: https://stackoverflow.com/questions/5896287/jquery-passing-value-from-one-input-to-another

WordPress Contact Form 7 Image Size Validation [closed]

As per contact form 7 setting placeholder. You can use the placeholder option for the following types of form tags: text, email, url, tel, textarea, number, range, date, and captchar. But its little bit tricky for adding custom placeholder in dropdown. Sometimes we need match custom designed form with contact form but for adding placeholder … Read more

If you know enough about php, jquery and css, you can use shortcode in contactform 7, this plugin bring ability to integrate a shortcode inside your contact form, then you can write that shortcode with any functionality you like. I recommend to add a filter in your shortcode and then by using metabox make your … Read more

I just figured it out, kind of a stupid mistake. $mail[‘attachments’] expects a string not an array. When adding multiple attachments each file needs to have a new line after it e.g. \n For reference see the Contact Form 7 mail.php file located in the includes folder: https://github.com/wp-plugins/contact-form-7/blob/master/includes/mail.php#L113