{"workflow":{"id":12755,"name":"Generate and post Instagram captions with Google Drive, GPT-4.1-mini, Gmail and Blotato","views":519,"recentViews":1,"totalViews":519,"createdAt":"2026-01-16T13:41:53.663Z","description":"# Social Media Post & Caption Generator (Google Drive → AI Caption → Approval → Auto-Post)\n\nAutomatically turn your existing content library into approved, AI-written social media posts.\nThis workflow selects a random file from Google Drive, generates an Instagram caption using AI, sends it to you for approval, and—once approved—uploads and publishes the post via Blotato.\n\n🎥 Watch Step-By-Step Guide:\nhttps://youtu.be/9XU9ECcj9dg\n\n## What this template does\n\nOn a scheduled basis (default: 10:00 AM), this workflow:\nSearches a specified Google Drive folder for content files\nRandomly selects one file to avoid repetitive posting\nUses AI to generate an Instagram-ready caption based on the file name\nSends the caption + file link to you via email for approval\n\nIf approved:\nDownloads the file from Drive\nUploads the media to Blotato\nCreates and publishes the social media post\n\nIf rejected:\nAutomatically loops back and selects a different random file\n\n## Why it’s useful\nKeeps your social media consistent with minimal manual effort\nAdds a human-in-the-loop approval step for quality control\nEliminates the need to manually write captions or pick content\nIdeal for creators, solo marketers, and small teams managing content at scale\n\nRequirements\nBefore using this template, connect the following credentials in n8n:\nGoogle Drive OAuth (searching & downloading files)\nOpenAI API (caption generation)\nGmail OAuth (approval email workflow)\nBlotato API (media upload & social posting)\n\nAll credentials must be added manually after importing the template.\nNo sensitive data is included in the template.\nHow it works (Node overview)\nSchedule Trigger\nRuns the workflow at a fixed time each day.\nGoogle Drive – Search Files and Folders\nFetches all files from a specified Drive folder.\nRandomizer (Code Node)\nSelects a random file from the available list to ensure content variety.\nCaption Generator AI\nUses an AI model to generate a descriptive Instagram caption based on the file name.\nGmail – Send for Approval and Wait\nEmails the generated caption and file link to you and pauses execution until approval or rejection.\nIF (Approved)\nYes: proceeds to download, upload, and publish\nNo: loops back to select another random file\nGoogle Drive – Download File\nDownloads the approved content file.\nBlotato – Upload Media & Create Post\nUploads the media and publishes the post to the connected social account.\n\n## Setup instructions\n\nImport the template into your n8n workspace\nOpen the Google Drive nodes and connect your Drive OAuth credential\nReplace the Folder ID with your own content folder\nConnect your OpenAI credential in the Caption Generator node\nConnect Gmail OAuth and set your approval email address\nConnect your Blotato account and select the target social profile\nRun the workflow once to test the approval loop\nActivate the workflow to start automated posting\n\n## Customization ideas\n\nAdjust the AI system prompt to change tone (funny, educational, sales-focused)\n\nAdd hashtag rules (e.g. max 5 hashtags, niche-specific only)\n\nReplace random selection with “least recently posted” logic using a Data Table\n\nDuplicate the Blotato node to post to multiple platforms\n\nAdd a fallback step to auto-edit captions that exceed character limits\n\n## Troubleshooting\n\nNo files found: confirm the Google Drive folder ID and permissions\n\nApproval email not received: check Gmail OAuth scopes and spam folder\n\nCaption quality not ideal: refine the AI system prompt\n\nUpload fails: confirm Blotato account permissions and social account connection","workflow":{"id":"BlsAiz7wRMow8Bgt","name":"Social Media Post & Caption Generator with Approval Loop","tags":[],"nodes":[{"id":"a3b97c74-633e-4b41-aff8-31d5b982934e","name":"Schedule Trigger","type":"n8n-nodes-base.scheduleTrigger","position":[-112,0],"parameters":{"rule":{"interval":[{"triggerAtHour":10}]}},"typeVersion":1.3},{"id":"cdbbf945-5a65-43b6-9523-300010ddcafa","name":"Search files and folders","type":"n8n-nodes-base.googleDrive","position":[208,0],"parameters":{"filter":{"folderId":{"__rl":true,"mode":"list","value":"1Xs6aYQZwB4uBO9Fxxjf0bM6fx_9OYWXi","cachedResultUrl":"https://drive.google.com/drive/folders/REPLACE_WITH_YOUR_FOLDER_ID","cachedResultName":"n8n Folder 2"}},"options":{},"resource":"fileFolder","returnAll":true},"typeVersion":3},{"id":"ebf94bd1-95c1-47d0-9bda-e452a248d42d","name":"If","type":"n8n-nodes-base.if","position":[1184,0],"parameters":{"options":{},"conditions":{"options":{"version":3,"leftValue":"","caseSensitive":true,"typeValidation":"strict"},"combinator":"and","conditions":[{"id":"19235ed8-1738-4c56-bec2-10da3c5c91b3","operator":{"type":"boolean","operation":"equals"},"leftValue":"={{ $json.data.approved }}","rightValue":true}]}},"typeVersion":2.3},{"id":"f9312cb6-0b30-4ae3-a6de-9dbbb0744abc","name":"Upload media","type":"@blotato/n8n-nodes-blotato.blotato","position":[1680,-16],"parameters":{"resource":"media","useBinaryData":true},"typeVersion":2},{"id":"2c47ed7a-bf26-4818-aee1-a38812c40ade","name":"Create post","type":"@blotato/n8n-nodes-blotato.blotato","position":[1888,-16],"parameters":{"options":{},"accountId":{"__rl":true,"mode":"list","value":"ID","cachedResultUrl":"Redacted","cachedResultName":"Redacted"},"postContentText":"={{ $('Caption Generator AI').item.json.output[0].content[0].text }}","postContentMediaUrls":"={{ $json.url }}"},"typeVersion":2},{"id":"ac0a4ffd-8a3b-47c5-ab7a-18d2d7cb0576","name":"Randomizer","type":"n8n-nodes-base.code","position":[416,0],"parameters":{"jsCode":"// Get all input items\nconst items = $input.all();\n\n// Check if there are any items\nif (items.length === 0) {\n  return [];\n}\n\n// Select a random item\nconst randomIndex = Math.floor(Math.random() * items.length);\nconst randomItem = items[randomIndex];\n\n// Return the random file with its data\nreturn [randomItem];"},"typeVersion":2},{"id":"4f57cc2e-11ca-4b1a-acb0-134ce6963b7a","name":"Caption Generator AI","type":"@n8n/n8n-nodes-langchain.openAi","position":[624,0],"parameters":{"modelId":{"__rl":true,"mode":"list","value":"gpt-4.1-mini","cachedResultName":"GPT-4.1-MINI"},"options":{},"responses":{"values":[{"content":"=File name:{{ $json.name }}\nCreate an effective caption for a social media post (Instagram) that goes along with the post."},{"role":"system","content":"=You are a social media (Instagram) Caption specialist. Your job is to come up with an effective caption based on the title/file name which will be descriptive of the photo."}]},"builtInTools":{}},"typeVersion":2.1},{"id":"2f5c7a16-e9ef-48e8-b69a-69fd21ccaf3b","name":"Send For Approval and Wait","type":"n8n-nodes-base.gmail","position":[976,0],"parameters":{"sendTo":"REPLACE_WITH_YOUR_EMAIL","message":"=Content File: https://drive.google.com/file/d/{{ $('Randomizer').item.json.id }}/view\nCaption: {{ $json.output[0].content[0].text }}","options":{},"subject":"Social Media Post for Approval","operation":"sendAndWait","approvalOptions":{"values":{"approvalType":"double"}}},"typeVersion":2.2},{"id":"7e2a7fdd-2736-421a-98fc-93808db70a78","name":"Download Content File","type":"n8n-nodes-base.googleDrive","position":[1472,-16],"parameters":{"fileId":{"__rl":true,"mode":"id","value":"={{ $('Randomizer').item.json.id }}"},"options":{},"operation":"download"},"typeVersion":3},{"id":"e446bba8-96b8-4d91-b456-613c0dc783d4","name":"Sticky Note","type":"n8n-nodes-base.stickyNote","position":[-320,-272],"parameters":{"width":416,"height":768,"content":"Scheduled Event Trigger"},"typeVersion":1},{"id":"69c44474-74c6-43c7-9c21-5251b82c1de1","name":"Sticky Note1","type":"n8n-nodes-base.stickyNote","position":[112,-272],"parameters":{"color":4,"width":464,"height":768,"content":"Search File + Randomizer"},"typeVersion":1},{"id":"0368ea52-6234-4357-8821-acf725128960","name":"Sticky Note2","type":"n8n-nodes-base.stickyNote","position":[592,-272],"parameters":{"color":2,"width":784,"height":768,"content":"Caption Generator & Email Approval"},"typeVersion":1},{"id":"9ce986d8-793f-4a7d-8e2a-1eac979ccb31","name":"Sticky Note3","type":"n8n-nodes-base.stickyNote","position":[1392,-272],"parameters":{"color":5,"width":704,"height":768,"content":"Upload to Social MEdia"},"typeVersion":1},{"id":"5815be84-0b6a-411e-b407-25e3cd3f9c80","name":"Sticky Note4","type":"n8n-nodes-base.stickyNote","position":[-1408,-432],"parameters":{"width":976,"height":1488,"content":"Social Media Post & Caption Generator (Google Drive → AI Caption → Approval → Auto-Post)\n\nAutomatically turn your existing content library into approved, AI-written social media posts.\nThis workflow selects a random file from Google Drive, generates an Instagram caption using AI, sends it to you for approval, and—once approved—uploads and publishes the post via Blotato.\n\n🎥 Watch Step-By-Step Guide:\nhttps://youtu.be/9XU9ECcj9dg\n\nWhat this template does\n\nOn a scheduled basis (default: 10:00 AM), this workflow:\nSearches a specified Google Drive folder for content files\nRandomly selects one file to avoid repetitive posting\nUses AI to generate an Instagram-ready caption based on the file name\nSends the caption + file link to you via email for approval\n\nIf approved:\nDownloads the file from Drive\nUploads the media to Blotato\nCreates and publishes the social media post\n\nIf rejected:\nAutomatically loops back and selects a different random file\n\nWhy it’s useful\nKeeps your social media consistent with minimal manual effort\nAdds a human-in-the-loop approval step for quality control\nEliminates the need to manually write captions or pick content\nIdeal for creators, solo marketers, and small teams managing content at scale\n\nRequirements\nBefore using this template, connect the following credentials in n8n:\nGoogle Drive OAuth (searching & downloading files)\nOpenAI API (caption generation)\nGmail OAuth (approval email workflow)\nBlotato API (media upload & social posting)\n\nAll credentials must be added manually after importing the template.\nNo sensitive data is included in the template.\nHow it works (Node overview)\nSchedule Trigger\nRuns the workflow at a fixed time each day.\nGoogle Drive – Search Files and Folders\nFetches all files from a specified Drive folder.\nRandomizer (Code Node)\nSelects a random file from the available list to ensure content variety.\nCaption Generator AI\nUses an AI model to generate a descriptive Instagram caption based on the file name.\nGmail – Send for Approval and Wait\nEmails the generated caption and file link to you and pauses execution until approval or rejection.\nIF (Approved)\nYes: proceeds to download, upload, and publish\nNo: loops back to select another random file\nGoogle Drive – Download File\nDownloads the approved content file.\nBlotato – Upload Media & Create Post\nUploads the media and publishes the post to the connected social account.\n\nSetup instructions\n\nImport the template into your n8n workspace\nOpen the Google Drive nodes and connect your Drive OAuth credential\nReplace the Folder ID with your own content folder\nConnect your OpenAI credential in the Caption Generator node\nConnect Gmail OAuth and set your approval email address\nConnect your Blotato account and select the target social profile\nRun the workflow once to test the approval loop\nActivate the workflow to start automated posting\n\nTroubleshooting\n\nNo files found: confirm the Google Drive folder ID and permissions\nApproval email not received: check Gmail OAuth scopes and spam folder\nCaption quality not ideal: refine the AI system prompt\nUpload fails: confirm Blotato account permissions and social account connection"},"typeVersion":1},{"id":"0cf30e12-68f8-4f78-a253-3483a6445a40","name":"Sticky Note5","type":"n8n-nodes-base.stickyNote","position":[-320,-848],"parameters":{"width":720,"height":544,"content":"@[youtube](9XU9ECcj9dg)"},"typeVersion":1}],"active":false,"pinData":{},"settings":{"availableInMCP":false,"executionOrder":"v1"},"versionId":"c1b6212a-1317-435d-865a-0aa2821aa38b","connections":{"If":{"main":[[{"node":"Download Content File","type":"main","index":0}],[{"node":"Search files and folders","type":"main","index":0}]]},"Randomizer":{"main":[[{"node":"Caption Generator AI","type":"main","index":0}]]},"Upload 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Marc","username":"marconi","bio":"Automating Start-Up and Business processes. \nHelping non-techies understand and leverage Agentic AI with easy to understand step-by-step tutorials.\nCheck out my educational content:\nhttps://www.youtube.com/@Automatewithmarc\n","verified":true,"links":["https://www.youtube.com/@Automatewithmarc"],"avatar":"https://gravatar.com/avatar/b9654a0dd147e6f3fa7e6eb601b6572b8051c8ab4cb693774451adf9a6294798?r=pg&d=retro&size=200"},"nodes":[{"id":20,"icon":"fa:map-signs","name":"n8n-nodes-base.if","codex":{"data":{"alias":["Router","Filter","Condition","Logic","Boolean","Branch"],"details":"The IF node can be used to implement binary conditional logic in your workflow. You can set up one-to-many conditions to evaluate each item of data being inputted into the node. 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