What probably matters to youSection of the release
What
When fetching an image or file attached to an artifact is blocked by network egress rules, the error now says which frame host was refused and tells you to allow *.frame.claudeusercontent.com (and its staging variant) in your sandbox or desktop app network settings.
Details
Three distinct failures are reported: blocked by egress policy, denied, and refused by the proxy.
The message makes clear that access to the artifact itself is unaffected.
Evidence
so the asset cannot be fetched (access to the artifact itself is fine)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
