Prevent WhatsApp to save sent media

I see that whenever I send via WhatsApp a media already existing in my device, being it a picture or a video, the app automatically creates a copy of it in Internal memory\Android\media\com.whatsapp\WhatsApp\Media\WhatsApp Images\Sent Internal memory\Android\media\com.whatsapp\WhatsApp\Media\WhatsApp Video\Sent This means that if I take a picture with my phone, then send it to two chats I get two copies of it in *\WhatsApp Images\Sent. Is there a way to prevent this? Alternatively, should I delete all files in those folders by hand or is there a better way of doing it? I don't want to occupy space in my memory with duplicates.