Task: Get all the slides from a presentation and get thumbnails of pages

n8n workflow:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[270,280],"parameters":{},"typeVersion":1},{"name":"Google Slides","type":"n8n-nodes-base.googleSlides","position":[470,280],"parameters":{"operation":"getSlides","returnAll":true,"authentication":"oAuth2","presentationId":"11myCBTn3IT-Iww01WMz43L7HUmQdL6cCR6NCtpsZer0"},"credentials":{"googleSlidesOAuth2Api":"Google Slides Credentials"},"typeVersion":1},{"name":"Google Slides1","type":"n8n-nodes-base.googleSlides","position":[670,280],"parameters":{"download":true,"resource":"page","operation":"getThumbnail","pageObjectId":"={{$json[\"objectId\"]}}","authentication":"oAuth2","presentationId":"={{$node[\"Google Slides\"].parameter[\"presentationId\"]}}"},"credentials":{"googleSlidesOAuth2Api":"Google Slides Credentials"},"typeVersion":1}],"connections":{"Google Slides":{"main":[[{"node":"Google Slides1","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Google Slides","type":"main","index":0}]]}}}