To help secure your specific setup, could you tell me you are currently running? If you are facing a security issue, let me know which web server software you use so I can provide the exact commands to lock it down. Share public link
The most critical component of exposed DCIM files is the metadata. JPEG and MP4 files contain EXIF data, which includes the exact date, time, camera model, and, frequently, the precise GPS coordinates of where the photo was taken. index of dcim 2021
Disclaimer: When attempting data recovery, do not save new files to the SD card, as this may overwrite the data you are trying to restore. To help secure your specific setup, could you