Some older or "off-brand" photo-sharing and storage apps do not use secure, encrypted buckets. Instead, they store user uploads in predictable, unindexed directories.
If you are searching for this term to understand how files are indexed or, more importantly, how to protect your own private photos from appearing in these public directories, here is a comprehensive guide on how the "index of" vulnerability works and how to secure your digital footprint. Understanding the "Index of" Directory index of my boobs jpg
Securing your personal media requires a proactive approach to understanding how servers share information with the world. Some older or "off-brand" photo-sharing and storage apps