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[JammyDodger]

There’s a bit of info about S3 in these posts I’ve fished out of the auto-timer if they’re any help?

@travelvc

I was able to fix this by adding the following CORS policy in my S3 bucket configuration.

<CORSConfiguration>
 <CORSRule>
   <AllowedOrigin>https://mydiscourse.url/</AllowedOrigin>
   <AllowedMethod>GET</AllowedMethod>
   <AllowedHeader>*</AllowedHeader>
   <ExposeHeader>Access-Control-Allow-Origin</ExposeHeader>
 </CORSRule>
</CORSConfiguration>

@Ed_Bobkov

It’s necessary to add, that if you see this text in the error message from origin 'https://lounge.travelmassive.com' has been where your domain is without slash / at the end, then in the CORS configuration you should also add your domain without slash at the end like this:
https://mydiscourse.url