strapi-upload-body-limits

On the Strapi side, the body middleware parses incoming requests. Uploaded files arrive as multipart data, so formidable.maxFileSize is the option that caps them. The formLimit and jsonLimit options cover ordinary form fields and JSON payloads, not the file itself:

/config/middlewares.js

module.exports = [
  // ...
  {
    name: 'strapi::body',
    config: {
      formLimit: '100mb', // form body
      jsonLimit: '100mb', // JSON body
      textLimit: '100mb', // text body
      formidable: {
        maxFileSize: 100 * 1024 * 1024, // uploaded file size, in bytes
      },
    },
  },
  // ...
];

The Media Library provider enforces a separate sizeLimit, which defaults to 1 GB. To change it, see local upload provider configuration and max file size.