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AI Automationfree

Create Instagram carousels and TikTok slideshows with OpenAI and PostFast

by Petar Georgievadapted from n8n official workflow galleryUpdated Aug 2026
RequiresCCodeHTTP RequestHTTP RequestOpenAITelegramTelegram
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ScEvery Mon Wed Fri at 8amEvery Mon Wed F…SeConfigure carousel brand and topicsConfigure carou…PFGet connected accounts (PostFast)Get connected a…CoSelect target accountsSelect target a…Write the carousel postWrite the carou…CoPrepare slide promptsPrepare slide p…Generate slide imagesGenerate slide …Preview slides in TelegramPreview slides …Ask for approval on TelegramAsk for approva…IfCarousel approved?Carousel approv…NODeclined, nothing postedDeclined, nothi…CoFan out per accountFan out per acc…PFGet upload URLs (PostFast)Get upload URLs…CoPair slides to upload URLsPair slides to …HRUpload slides to storageUpload slides t…CoBuild carousel postsBuild carousel …PFSchedule carousels via PostFastSchedule carous…12345678910111213141516
1/5
STEPS · 16
Runs on a schedule

Quick overview This workflow runs on a Mon/Wed/Fri schedule to generate an Instagram carousel or TikTok slideshow using OpenAI (GPT-4o-mini and gpt-image-1), sends the slides to Telegram for approval, and only then uploads the images and schedules the post via PostFast. How it works Runs every Monday, Wednesday, and Friday at 8am and loads your brand, topics, slide count, platform filter, and Telegram chat ID. Retrieves your connected social accounts from PostFast and keeps only accounts that are connected and match the selected platforms. Uses OpenAI (gpt-4o-mini) to write a carousel as strict JSON containing a caption and slide-by-slide headings, body text, and visual descriptions. Builds per-slide image prompts and uses OpenAI (gpt-image-1) to generate a 1024×1536 portrait image for each slide. Sends the generated slide images to Telegram and waits for you to approve or decline posting. If approved, requests per-account upload URLs from PostFast, uploads each slide image to the provided storage URLs, and schedules one PostFast social post per account with the slides in order and the generated caption.

Tags

n8nreference-onlyopen-aitelegram
Connects
CCodeWHTTP RequestOpenAItelegramTelegram
CategoryAI Automation
Triggermanual
Complexitycomplex
Nodes17
AddedJul 16, 2026

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