Automate image editing & Instagram posting with Nano Banana & GPT-5 captions

Auto-Edit Google Drive Images with Nano Banana + Social Auto-Post Drop an image into Google Drive and let this workflow handle the rest: it auto-cleans and enhances the image with Google’s Nano Banana (via Wavespeed API), generates a catchy caption with GPT-5, and publishes directly to your connected social accounts using Postiz. 👉 Watch step-by-step video tutorials of workflows like these on https://www.youtube.com/watch?v=4wk6PYgBtBM&list=PL05w1TE8X3bb1H9lXBqUy98zmTrrPP-s1 What it does - Triggers from Google Drive when a new image is uploaded - Sends the image to Nano Banana to declutter, brighten, and make it real-estate/photo-listing ready - Polls for the edited result until it’s complete - Logs the edited image URL into Google Sheets for tracking - Downloads and uploads the edited image into Postiz media library - Generates an engaging caption with GPT-5 Caption Agent - Publishes instantly to Instagram (can be extended to TikTok, LinkedIn, etc.) Perfect for - Real-estate agents posting property shots - Ecommerce sellers updating product catalogs - Social media marketers needing fast, polished posts - Apps & Services Tools Used - Google Drive (Trigger) - Wavespeed API – Google Nano Banana (Image editing) - Google Sheets (Logging) - Postiz (Social scheduling/posting) - OpenAI GPT-5 (Caption agent) Setup - Connect your Google Drive and select the upload folder. - Add your Wavespeed API key for Nano Banana. - Connect Google Sheets for logging. - Add Postiz API credentials and set the integration ID for your channel(s). - Enter your OpenAI API key for GPT-5 captioning. Customization - Adjust the edit prompt for different use cases (e.g., product cleanup, lighting tweaks). - Change Postiz post type to scheduled instead of “now.” - Add more Postiz posts for multi-platform publishing. - Insert an approval loop (Slack/Email) before posting. Logs - Edited Image Log (Sheets): stores final image URL + timestamp. - Publishing Log (Sheets): tracks workflow status per asset. Notes - Sticky notes in the template explain each major block. - Replace sample IDs with your own (folder IDs, sheet IDs, Postiz integration). - Keep all API keys in n8n Credentials, not in node parameters.