Design keys for retrieval
A key is the object's name within its bucket, so consistent prefixes can group related files for listing and lifecycle work. Use predictable separators and avoid ambiguous names that collide when files are uploaded by different users or processes.
Do not put secrets, credentials, or unnecessary personal data in keys: names may appear in logs, URLs, or operational tools. If the source filename contains sensitive details, use an internal identifier and store descriptive metadata under appropriate access controls.
Treat versions as separate objects unless configured otherwise
Uploading a new object at the same key may replace or supersede the prior content according to the storage behavior in use. To preserve history explicitly, use a versioned key pattern or the platform's documented versioning feature rather than assuming old bytes remain available.
Record the relationship between a user-facing file and its storage key in your database, and update that reference only after confirming the upload succeeded. Test listing, retrieval, and cleanup using a small sample before applying a naming or retention policy broadly.