TCPDF error: Missing or incorrect image file: https://substackcdn.com/image/fetch/$s_!pwdR!,w_1456,c_limit,f_webp,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F9b8762d0-0ea3-4112-962c-ed1d75ed5bcc_720x493.jpeg