I need to upload files larger than 100MB. So far, I have modified bothMax image size KB and Max attachment size KB , and I plan to also modify upload_size in app.yml . However, I noticed that there is no upload_size in the params section of app.yml . Here is the excerpt I copied: params: db_defau…

That could be the likely cause, cloudflare by default has a 100mb size limit iirc. You can turn off their protection temporarily and try again.

Hi, You need to add them under params :slight_smile:

Thank you for the reply. I have now successfully modified app.yml and rebuilt the container. The changes I made are as follows: ## Which Git revision should this container use? (default: latest) #version: latest ## Maximum upload size (default: 10m) upload_size: 300m However, the upload fi…

That error is coming from elsewhere , do you happen to have a reverse proxy in front of discourse?

It’s possible. Our domain registrar is Cloudflare, and the domain is using Cloudflare’s free plan for DNS resolution. I wonder if that could be the issue.

Hit this very recently with of all things a car toll payment system that required you to upload documents to register your car. They used cloudflare and if you uploaded documents that were too big, instead of a nice app error you got a cloudflare 502!

在更改Cloudflare设置后，大于100MB的文章已经可以正常上传。

Issue with Upload File Size Limit

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itsbhanusharma (Bhanu Sharma) 2026 年5 月 6 日 07:41 6

这很可能是原因所在。据我所知，Cloudflare 默认有 100MB 的大小限制。您可以暂时关闭其保护功能，然后重试。

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Issue with Upload File Size Limit

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