This is built-in in Dokku 0.23+

[bfontaine]

Hello,
Thank you for this useful plugin. You should probably state somewhere in the README that this feature is built-in in Dokku 0.23+: https://dokku.com/docs/networking/proxies/nginx/#specifying-a-custom-client_max_body_size
If you set the max_upload_size both with Dokku and this plugin, you get an error when you try to redeploy:

"client_max_body_size" directive is duplicate in /home/dokku/your-app/nginx.conf.d/upload.conf:1

(this is not really an issue, just a heads up 😉 )

[fnceba]

For anyone wondering, how to get rid of the issue after uninstalling the plugin, you'll need to manually remove upload.conf file:

sudo rm /home/dokku/APP_NAME/nginx.conf.d/upload.conf