[AI Search] Document extensionless R2 object support

[G4brym]

Summary

Documents how AI Search uses Content-Type metadata to index R2 objects without filename extensions. Adds a changelog entry and explains which Content-Type values are unsupported.

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) - how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

⚠️ 1 warning found in commit 3eee3fe.

👉 Fix in your agent 👈

Fix the following review findings in PR #33365 (https://github.com/cloudflare/cloudflare-docs/pull/33365).

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---

## Code Review

### Warnings (1)

#### CR-c811d8aabd30 · Contradictory content
- **File:** `src/content/docs/ai-search/configuration/data-source/r2.mdx` line 27
- **Issue:** Line 25 states AI Search uses recognized filename extensions as its preferred detection path, implying Content-Type only matters for extensionless objects. Line 27 then states objects with a missing, unsupported, malformed, or `application/octet-stream` `Content-Type` are not supported, with no qualification — so an object like `notes.md` with an `application/octet-stream` Content-Type is simultaneously said to be detected by extension (supported) and to be unsupported.
- **Fix:** Qualify the second sentence to scope it to the extensionless case, e.g. "R2 objects without a recognized filename extension that have a missing, unsupported, malformed, or `application/octet-stream` `Content-Type` are not supported", or state the precedence rule explicitly (extension first, Content-Type fallback) so the two claims do not conflict.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

Warnings (1)

File

Issue

ai-search/configuration/data-source/r2.mdx line 27

Contradictory content — Line 25 states AI Search uses recognized filename extensions as its preferred detection path, implying Content-Type only matters for extensionless objects. Line 27 then states objects with a missing, unsupported, malformed, or application/octet-stream Content-Type are not supported, with no qualification — so an object like notes.md with an application/octet-stream Content-Type is simultaneously said to be detected by extension (supported) and to be unsupported. Fix: Qualify the second sentence to scope it to the extensionless case, e.g. "R2 objects without a recognized filename extension that have a missing, unsupported, malformed, or application/octet-stream Content-Type are not supported", or state the precedence rule explicitly (extension first, Content-Type fallback) so the two claims do not conflict.

Conventions

_{No convention issues found.}

Style Guide Review

_{No style-guide issues found.}

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/changelog/ai-search/	@aninibread, @irvinebroque, @mchenco, @rita3ko, @cloudflare/pm-changelogs, @cloudflare/product-owners
/src/content/docs/ai-search/	@aninibread, @G4brym, @irvinebroque, @mchenco, @rita3ko, @cloudflare/product-owners

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Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/post/2026-09-11-extensionless-r2-content-type/	https://ai-search-extensionless-r2-content-type.preview.developers.cloudflare.com/changelog/post/2026-09-11-extensionless-r2-content-type/
https://developers.cloudflare.com/ai-search/configuration/data-source/r2/	https://ai-search-extensionless-r2-content-type.preview.developers.cloudflare.com/ai-search/configuration/data-source/r2/