n8n Instagram Auto-Posting: Google Drive + Gemini Vision Captions

Automatically post Instagram updates from your Google Drive—powered by Google Gemini Vision captions

This n8n workflow automatically picks an image from a Google Drive folder every 3 days, uses Google Gemini Vision to generate a ready-to-publish Instagram caption, and publishes the post to your Instagram Business Account via the Instagram Graph API.

What this workflow does

• Schedules posting with a scheduled trigger to run every 3 days at 19:30.
• Sets key configuration values for your Instagram presence, including the Instagram Business Account ID, CTA link, and brand context.
• Searches a specified Google Drive folder for an image and downloads the file.
• Sends the image to Google Gemini Vision to generate a formatted Instagram caption, returned as JSON.
• Uses the Facebook/Instagram Graph API to:
  • create an Instagram media container using the image URL and the generated caption
  • publish the container to your Instagram Business account

Use cases

• Agencies and SaaS operators who want hands-off Instagram content publishing from a centralized asset folder.
• Teams that pre-collect images in Google Drive and want Gemini Vision to produce caption drafts consistently with brand context.
• Content workflows where media is managed in Google Drive but publishing is handled through n8n automation and the Instagram Graph API.

Technical details

• n8n nodes/stack: schedule trigger, Google Drive, HTTP request, and Google Gemini Vision (via n8n-nodes-langchain “Google Gemini”).
• Graph API calls for create-container and publish steps for Instagram media.
• Setup requirements:
  • Add Google Drive OAuth2 credentials and update the Drive folder ID.
  • Add a Google Gemini API key in the Gemini node credentials.
  • Add a Facebook Graph API credential with permission to publish Instagram content (e.g., instagram_content_publish) and connect it to the correct Instagram Business account.
  • Update the placeholder Instagram Business Account ID, plus CTA link and brand context in the Config step.