Post visibility edit from Connections only to Public does not propagate to search index

Goal

Determine whether changing a published post's audience from Connections only to Public retroactively makes the content eligible for external search indexing and non-connection follower feeds.

Constraints and uncertainty

• The LinkedIn UI historically allows narrowing visibility (Public → Connections) but the behavior when broadening (Connections → Public) is not documented and appears inconsistent across web and mobile clients.
• Re-shares and comments inherit the original post's visibility constraints, so subsequent engagement cannot override the initial setting.
• Partner API endpoints expose a visibility field (PUBLIC vs CONNECTIONS), yet write access requires program approval, limiting programmatic verification.
• Feed ranking means eligibility ≠ delivery; even if the edit succeeds, reach is not guaranteed.

Questions

1. Does the UI currently permit editing a Connections only post to Public, and if so, does the change trigger re-indexing by external search engines?
2. Will non-connection followers who missed the post at publish time see it in their feed after the visibility edit?
3. Are there observable differences in edit behavior between the web composer, mobile app, and the UGC Posts API for approved partners?