http://swonderstzr43aczpcwdoyc25vwxngyromja7pyb5sf26ap3v535sxqd.onion/resources/about-photos-how-can-i-check-and-make-sure-they-do-not-contain-any-metadata-exif-for-malicious-people-to-track-me-or-identify-me
Even if there was no visible metadata shown then it does not mean the photo is free from tracking if steganography was added to the photo. Steganography is the practice of concealing a file, message, image or content within another file (in this case it would be the photos and media).