413 Payload Too Large error when uploading images in Laravel 12 with Dokploy and Nixpacks

[TranDuc41]

Hello Dokploy team,

I am encountering a "413 Payload Too Large" error when trying to upload image files in my Laravel 12 project deployed using Dokploy and Nixpacks.

Here are some details about my setup:

• Laravel version: 12.x
• Dokploy version: latest
• Using Nixpacks for deployment
• PHP version: 8.3-fpm
• Upload attempt: image file around 4.2 MB

I have already tried setting environment variables like:

PHP_UPLOAD_MAX_FILESIZE=50M
PHP_POST_MAX_SIZE=50M

However, the upload still fails with the 413 error. I suspect it might be related to Nginx or Dokploy/Nixpacks defaults.

Could you please advise how to properly increase the allowed upload size in this environment? Any guidance on where to configure this in Dokploy/Nixpacks would be appreciated.

Thank you in advance!