What is the safest way to roll this out?

Start with a limited scope, run shadow mode first, and require human approval for risky or external actions.

How can I measure whether this use case is working?

Track one speed metric and one quality metric, then review weekly to tune prompts, thresholds, and routing rules.

Use Case · file ops · remote sharing

OpenClaw Cloud R2 Upload Assistant: Share Files with Secure Presigned Links

Q: When should I use OpenClaw Cloud R2 Upload Assistant: Share Files with Secure Presigned Links instead of a fully manual workflow?

Use this workflow when repeated tasks follow stable patterns and you can define clear guardrails and escalation rules.

Upload artifacts to Cloudflare R2 or S3-compatible storage and generate controlled download links.

Last updated: 2026-03-09 · Language: English

0) TL;DR (3-minute launch)

Sharing build artifacts or customer files by hand often leads to broken links, wrong permissions, and zero audit trail.
Workflow in short: Receive file package + required retention/expiry policy → Validate filename, size, and destination bucket/prefix rules → Upload object to R2 (or S3-compatible target) with metadata tags → Generate presigned URL with explicit TTL and download constraints → Deliver link to the approved channel and record audit metadata → Revoke or rotate links when policy or incident response requires
Start fast: Configure one bucket, one prefix convention, and one retention policy first.
Guardrail: Never expose raw access keys in prompts, logs, or outbound messages.

1) What problem this solves

Sharing build artifacts or customer files by hand often leads to broken links, wrong permissions, and zero audit trail. This flow standardizes upload, link expiry, and access logging so teams can distribute files quickly without guessing about security.

2) Who this is for

Operators responsible for file ops decisions
Builders who need repeatable remote sharing workflows
Teams that want automation with explicit human checkpoints

3) Workflow map

Receive file package + required retention/expiry policy
      -> Validate filename, size, and destination bucket/prefix rules
      -> Upload object to R2 (or S3-compatible target) with metadata tags
      -> Generate presigned URL with explicit TTL and download constraints
      -> Deliver link to the approved channel and record audit metadata
      -> Revoke or rotate links when policy or incident response requires

4) MVP setup

Configure one bucket, one prefix convention, and one retention policy first
Allow uploads only from a trusted local directory or approved pipeline output
Default all presigned links to short TTL (for example 24 hours) unless overridden
Log uploader, object key, recipient, expiry time, and checksum for each share
Run weekly review for expired links and unexpected high-volume downloads

5) Prompt template

You are my secure file-delivery assistant for Cloudflare R2.
Goal: upload files safely and issue least-privilege download links.

When handling a request:
1) Confirm destination bucket, object key, and retention requirement.
2) Validate the file and deny uploads that violate naming or size policy.
3) Upload with encryption/metadata settings required by team policy.
4) Create a presigned URL with explicit expiry and include recipient instructions.
5) Append a complete audit record and flag anomalies for review.

Output format:
- Upload result
- Link details (TTL, scope)
- Audit record ID
- Any policy warnings

6) Cost and payoff

Cost

Primary costs are model calls, integration maintenance, and periodic prompt tuning.

Payoff

Faster execution cycles, fewer context switches, and clearer decision quality over time.

Scale

Add role-specific subagents, stronger evaluation metrics, and staged automation permissions.

7) Risk boundaries

Never expose raw access keys in prompts, logs, or outbound messages
Do not change bucket ACL/policy automatically during routine upload requests
Require human confirmation before sharing sensitive files to new recipients

9) FAQ

How quickly can this workflow deliver value?

Most teams see meaningful results within 1-2 weeks when they keep the initial scope narrow and measurable.

What should stay manual at the beginning?

Keep ambiguous, high-risk, or customer-impacting actions behind explicit human approval until quality is proven.

How do we prevent automation drift over time?

Review logs weekly, sample outputs, and tune prompts/rules as data patterns and business goals change.

What KPI should we track first?

Track one leading metric (speed or coverage) plus one quality metric (accuracy, escalation rate, or user satisfaction).