You are helping me build the following AI agent workflow.

## Goal
Instagram Reels Posting from Airtable: Automatically publishes Instagram Reels from an Airtable content calendar by uploading videos via API and updating record status.

## Specification
- What it does: You automatically publish your scheduled Instagram Reels by having the system pull content from your Airtable calendar, upload videos via the Instagram Graph API, and update your records to reflect a posted status with media IDs for tracking.
- Trigger: On a schedule (Scheduled · daily 09:00)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - n8n: Workflow orchestration and scheduling
  - Airtable: Content calendar storage and record management
  - Instagram Graph API: Creating media containers and publishing reels

## Known pitfalls, handle each one explicitly in your implementation
1. Instagram requires a valid access token with manage_pages and instagram_content_publish scopes, so verify permissions before starting the build.
2. Airtable row updates can fail if multiple instances of the workflow run simultaneously, add a locking mechanism or unique record ID check to avoid race conditions.
3. The Instagram Graph API has strict file size and format limits for reels, validate video specs in Airtable before attempting upload to save API quota.

## Reference implementation
https://n8n.io/workflows/8098 (workflow template)
Fetch and inspect this before building. If it matches my stack, adapt it;
if not, rebuild the pattern with my tools.

## Process requirements
1. Before building: ask me which of the listed tools I actually use and
   what my platform is (n8n / Make / code / other). Do not assume.
2. Adapt the pattern to my answers; do not force the reference stack.
3. Address every pitfall above; tell me how you handled each.
4. Provide a test plan I can run before letting this touch real data.
5. Ask before any step that sends messages, modifies data, or spends money.

Source: https://usecasesforagents.com/use-case/automated-instagram-reels-posting-from-airtable/ via usecasesforagents.com