Generate and publish social posts with Gemini, Kie.ai, and Zernio API

Quick overview Generate & publish social media content with Gemini, Kie.ai, and Zernio API How it works Google Gemini (gemini-2.5-flash) generates platform-optimized copy for Facebook, Instagram, LinkedIn, and TikTok, returned as structured JSON with hashtags and a suggested posting time. Kie.ai Seedream v4 creates a branded 1080x1080 image; the workflow polls the task until the CDN image URL is ready. The image is uploaded to Zernio: direct multipart upload for files up to 4MB, presigned upload (init + PUT) for larger files up to 5GB. A post is created on each enabled platform through the Zernio posts endpoint, with the correct platform and accountId mapping, and published immediately. All

Help me set up the n8n workflow "Generate and publish social posts with Gemini, Kie.ai, and Zernio API" (https://n8n.io/workflows/8965). It uses: HTTP Request, Code. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.