This is almost certainly fallout from database replication. During
normal operation, it will take 30-60 seconds for the information about
the upload to propagate to the replica database. It is quite likely that
when attempting to view this page with a web browser, the replica
database is hit and the information doesn't yet exist.

It may be a simple solution to force the use of the master for this
particular page. This would be a malone fix.

An alternative is to update the publisher so, if a 404 is generated and
the replica database used, the request is retried using the master
database (quite similar to the Retry mechanism used to handle database
deadlocks and serialization exceptions). This would be an infrastructure
fix.

-- 
Delay between blob submission and blob availability causes Launchpad to OOPS.
https://bugs.launchpad.net/bugs/311690
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