APITemplate.io and Gmail integration

Who is this for Content creators, solopreneurs, and marketing teams who produce long-form content (podcasts, newsletters, interviews, scripts) and want to automatically turn it into multiple social media assets -- Instagram carousels, LinkedIn carousels, LinkedIn text posts, and LinkedIn media posts -- with human-in-the-loop approval via Microsoft Teams. What this workflow does This workflow takes a long-form content file sent via email, extracts strategic content pillars using AI, then fans out into four parallel branches -- each producing a different social media format. Every draft is reviewed and approved in Microsoft Teams before images are generated, assets are saved to Google Drive, and posts are published via Blotato. How it works Email trigger -- A Gmail Trigger watches for emails with a specific subject line (e.g. "Content Repurposing"). The email contains a text attachment (podcast transcript, newsletter, etc.) and optionally a link to the original content. File extraction & storage -- The attachment is extracted, saved as a Google Doc in a timestamped project subfolder on Google Drive, and the source URL is parsed from the email body. AI content strategist -- The Repurpose Strategist agent (OpenAI) analyzes the full text and extracts 5 strategic content pillars, each with a hook headline, core insight, virality factor, and relevant quote. Results are logged in Google Sheets. Four parallel content branches -- The 5 pillars feed into four specialized AI agents that each produce a different format: Instagram/YouTube carousel -- 5 punchy one-liners (max 25 words each) + a social media caption LinkedIn carousel -- 5 slide texts with hooks + a companion caption, plus a styled PDF carousel via HTML-to-PDF LinkedIn text post -- A single strong LinkedIn post (max 100 words) LinkedIn media post -- A post with a guiding statement rendered as an image Human review loop -- Each branch sends its draft to Microsoft Teams for approval via a custom form (approve/reject with feedback). If rejected, feedback is routed back to the AI agent for targeted revisions. Asset generation & storage -- On approval, carousel images are generated via APITemplate.io, all assets (images, post texts, PDFs) are saved to organized Google Drive subfolders, and results are logged back to Google Sheets. Publishing -- Approved posts are published to Instagram and LinkedIn via Blotato, with status monitoring and Teams notifications on success or failure. Setup steps Gmail -- Create OAuth2 credentials. The trigger watches for emails with "Content Repurposing" in the subject. You can customize this filter. Google Drive & Docs -- Create OAuth2 credentials. Set the target folder ID in the Google Drive Trigger node where project subfolders will be created. Google Sheets -- Create a spreadsheet to serve as the content tracker. It will store pillars, carousel texts, post texts, and metadata. Update the Sheet ID in all Google Sheets nodes. OpenAI -- Add your API key. Used by 5 AI agents (strategist + 4 content specialists). Microsoft Teams -- Create OAuth2 credentials. Set the Teams chat ID in the 4 review nodes to route drafts to your approval channel. APITemplate.io -- Create an account and design carousel slide templates. Set the template ID in the image generation nodes. Blotato -- Connect your Instagram and LinkedIn accounts. Add the Blotato API credential and update account IDs in the publishing nodes. HTML-to-PDF -- Install the community node n8n-nodes-htmlcsstopdf (self-hosted only). Customize the carousel slide HTML/CSS template with your branding (logo, colors, profile photo). Requirements Community nodes:** @blotato/n8n-nodes-blotato n8n-nodes-htmlcsstopdf Self-hosted n8n only** (due to community nodes) Gmail OAuth2 credentials Google Drive, Docs & Sheets OAuth2 credentials OpenAI API key Microsoft Teams OAuth2 credentials APITemplate.io account and template Blotato account with connected Instagram and LinkedIn profiles How to customize AI prompts** -- Each of the 5 AI agents has a detailed system prompt you can adjust for tone, word count, language, or output structure. Carousel design** -- Edit the HTML/CSS in the "HTML to PDF" node to match your brand (colors, fonts, logo, profile photo). Update the APITemplate.io template IDs for Instagram-style slides. Platforms** -- Add or remove publishing branches. Currently supports Instagram (via Blotato) and LinkedIn (text post, carousel, media post). Review channel** -- Change the Teams chat ID to route to different teams or channels. Trigger** -- Swap Gmail for another trigger (e.g. Google Drive, webhook, or manual) depending on your content intake workflow. Feedback loop** -- Each branch supports unlimited revision cycles. The AI applies feedback minimally without rewriting from scratch.