Why is my upload limit 100mb?It's set to 500mb

I think the image max size 102400kb(100M) is hard coded in Discourse by design. The upload_size in app.yml is for configuring the nginx, you may want to configure the max attachment size kb setting which allows file size max to 1024000kb(1GB).

A 500MB image file rendered directly on the web page is horrible.

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