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Hi, the images are failing to load due to a 403 error.
This indicates a permission issue, You should make sure your sheet’s content is Public and not Private.
If you open the browsers developer console and try to open any of the image URL’s you will also be met with a 403 because the Google content is not Public.
Sheets has a Rest API. I’ve created python applications that write and read information from google sheets. There is also an option to make the information public so anyone can use it. I think using google drive or a document would be better than using sheets. Unless you want everyone to have access to the information it would probably be better to use a Restful state. If it is just images you would probably do better to put them in a drive folder and set the access to the public. Sheets are used for spreadsheet information. There is a company called sheety.co that will help you do rest calls. But, It has a fee of $9.00 a month.