Treat Generated Media URLs as Delivery References

Some media endpoints return an output URL or similar reference. Its availability period and download behavior may be endpoint-specific.
If the product needs to retain the result, do not expose the remote reference as the only permanent record.
Create an asset intake worker. Associate the reference with its generation job, restrict accepted source locations and redirects, bound the download size, verify the content type, and check whether application storage is permitted.
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After an approved download, compute a checksum, assign an application asset ID, and record the source job, access policy, and retention state.
Keep intake failure separate from generation failure. A model job may complete while the application fails to persist its output.
Usage logs can help correlate calls, but they do not replace asset storage records. Verify endpoint documentation and applicable terms before copying generated media.