Clear it in 3 steps
Start the environment
Investigate the target
Submit the flag

Photos and images contain metadata called EXIF. This metadata records shooting date, camera info, GPS coordinates, etc. Check the EXIF data of image_with_flag.jpg to find the flag! Available commands: - exiftool image_with_flag.jpg - cat image_with_flag.jpg | grep FLAG
Use the exiftool command to check image metadata
EXIF data has a comment field
Try viewing the file contents with the cat command