TCPDF error: Not a PNG file: https://npr.brightspotcdn.com/dims3/default/strip/false/crop/3600x2025+0+0/resize/900/quality/85/format/webp/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2F84%2F8a%2F50e211d0494594fe6147c0d1e91c%2Ftravel-accessibility25.png