Cannot enable public sharing on an artifact — error persists across all versions

Description

On the claude.ai Artifact share panel, toggling General access to a public option fails with an inline error:

This version can't be shared publicly. Publish a new version or change the shared version, then try again.

Steps to reproduce

1. Open an existing artifact you own via its claude.ai/code/artifact/{uuid} URL.
2. Click Share (top right).
3. Change General access from "Only you" to a public sharing option.
4. Error appears as above.

What I tried (both suggested by the error message itself)

• Changed the Shared version dropdown from "Latest" to a specific numbered version — same error.
• Retried the public toggle multiple times — error is consistent, not transient/a one-off race.

Expected behavior

Either the artifact becomes publicly shareable, or the UI surfaces a specific, actionable reason it can't be (e.g. naming an incompatible capability or version state), rather than a generic message whose own suggested remedies don't resolve it.

Environment

• Artifact: large (~4MB) static HTML report, originally published via Claude Code's Artifact tool, contains embedded images/exhibits.
• Sole owner, no team/org sharing attempted before going straight to public.
• Browser: Chromium-based, Windows 11.

Additional context

Happy to share the specific artifact ID/URL privately if that helps reproduce — omitted it here since this is a public issue and the artifact contains private content.