Task: Download and post an image on LinkedIn

n8n workflow:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"HTTP Request","type":"n8n-nodes-base.httpRequest","position":[440,300],"parameters":{"url":"https://n8n.io/n8n-logo.png","options":{},"responseFormat":"file"},"typeVersion":1},{"name":"LinkedIn","type":"n8n-nodes-base.linkedIn","position":[640,300],"parameters":{"text":"this is a test image post","person":"gZG0JALzuy","postAs":"person","additionalFields":{},"shareMediaCategory":"IMAGE"},"credentials":{"linkedInOAuth2Api":"linkedin_demo"},"typeVersion":1}],"connections":{"HTTP Request":{"main":[[{"node":"LinkedIn","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"HTTP Request","type":"main","index":0}]]}}}