Publish Instagram carousels from Google Sheets using Gemini and GCS

by Sami ✓ · 20 views · created 2026-08-26 · Social Media, Multimodal AI

What this workflow does

This AI workflow has 45 nodes and runs on a schedule (every day at 12:00). Along the way it connects Google Sheets, Google Gemini Chat Model, Google Cloud Storage and Facebook Graph API and 1 more. It also calls generativelanguage.googleapis.com over HTTP.

How it runs

Trigger: On a schedule (every day at 12:00).

1. Read Carousel Row (Google Sheets): read (sheet)
2. Select First Eligible Carousel Row (Code): runs custom JavaScript code
3. Carousel Row Eligible? (If): checks a condition and branches into true / false
4. Mark Carousel Row Processing (Google Sheets): update (sheet)
5. Prepare Carousel Inputs (Edit Fields (Set)): sets 7 fields: Topic, TargetAudience, BrandVoice…
6. Generate Carousel Concept (Basic LLM Chain): sends a prompt to an LLM, with model: Gemini — Carousel Concept; output parser: Parse Carousel Concept
7. Generate Carousel Caption (Basic LLM Chain): sends a prompt to an LLM, with model: Gemini — Carousel Caption; output parser: Parse Carousel Caption
8. Generate 5–6 Carousel Slides (Basic LLM Chain): sends a prompt to an LLM, with model: Gemini — Carousel Slides; output parser: Parse Carousel Slides
9. Build Carousel Slide Prompts (Code): runs custom JavaScript code
10. Generate Carousel Slide Image (HTTP Request): calls generativelanguage.googleapis.com (POST)

…plus 28 more steps. See the full node list below.

Services it uses

Google SheetsGoogle Gemini Chat ModelGoogle Cloud StorageFacebook Graph APIGmail

HTTP calls to: generativelanguage.googleapis.com

Before you upgrade to n8n 3.0

Nodes used (17)

• Schedule Triggern8n-nodes-base.scheduleTrigger
• Google Sheetsn8n-nodes-base.googleSheets
• Coden8n-nodes-base.code
• Ifn8n-nodes-base.if
• Edit Fields (Set)n8n-nodes-base.set
• Google Gemini Chat Model@n8n/n8n-nodes-langchain.lmChatGoogleGemini
• Structured Output Parser@n8n/n8n-nodes-langchain.outputParserStructured
• Basic LLM Chain@n8n/n8n-nodes-langchain.chainLlm
• HTTP Requestn8n-nodes-base.httpRequest
• Convert to Filen8n-nodes-base.convertToFile
• Edit Imagen8n-nodes-base.editImage
• Google Cloud Storagen8n-nodes-base.googleCloudStorage
• Facebook Graph APIn8n-nodes-base.facebookGraphApi
• Loop Over Items (Split in Batches)n8n-nodes-base.splitInBatches
• Stop and Errorn8n-nodes-base.stopAndError
• Waitn8n-nodes-base.wait
• Gmailn8n-nodes-base.gmail

From the author

Quick overview This workflow runs daily, reads a queued carousel request from Google Sheets, uses Google Gemini to generate a concept, caption, and 5–6 slide prompts, creates slide images, uploads them to Google Cloud Storage, and publishes the carousel to…

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