413 Request Entity Too Large

I am using Docker and PHP 7.4 and I faced this issue too.

Just added a line to the file *.conf inside docker/php74/ directory.

server {
    client_max_body_size 100M;
    ...
}

I had the same issue but in docker. when I faced this issue, added client_max_body_size 120M; to my Nginx server configuration,

nginx default configuration file path is /etc/nginx/conf.d/default.conf

server {
    client_max_body_size 120M;
    ...

it resizes max body size to 120 megabytes. pay attention to where you put client_max_body_size, because it effects on its scope. for example if you put client_max_body_size in a location scope, only the location scope will be effected with.

after that, I did add these three lines to my PHP docker file

RUN echo "max_file_uploads=100" >> /usr/local/etc/php/conf.d/docker-php-ext-max_file_uploads.ini
RUN echo "post_max_size=120M" >> /usr/local/etc/php/conf.d/docker-php-ext-post_max_size.ini
RUN echo "upload_max_filesize=120M" >> /usr/local/etc/php/conf.d/docker-php-ext-upload_max_filesize.ini

since docker PHP image automatically includes all setting files from the path (/usr/local/etc/php/conf.d/) into php.ini file, PHP configuration file will change by these three lines and the issue must disappear

Add ‘client_max_body_size xxM’ inside the http section in /etc/nginx/nginx.conf, where xx is the size (in megabytes) that you want to allow.

http {
      client_max_body_size 20M;         
}