TCPDF error: Missing or incorrect image file: https://substackcdn.com/image/fetch/$s_!M6uX!,w_1456,c_limit,f_webp,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F34b64505-14c9-4140-84f8-eb07899dd0f0_3900x2600.jpeg