Increase Upload File Size Limit with Ubuntu/PHP

To increase the upload size limit, edit the PHP configuration file.

If you using php7.4 then replace 8.1 to 7.4 in the below commands

sudo nano /etc/php/8.1/fpm/php.ini

Find the following line.

upload_max_filesize = 2M

Change the value like below. Note that this value should not be larger than the attachment size limit set by Postfix SMTP server.

upload_max_filesize = 50M

Then find the following line.

post_max_size = 8M

Change the maximum size of POST data that PHP will accept.

post_max_size = 50M

Save and close the file. Alternatively, you can run the following two commands to change the value without manually opening the file.

sudo sed -i 's/upload_max_filesize = 2M/upload_max_filesize = 50M/g' /etc/php/8.1/fpm/php.ini

sudo sed -i 's/post_max_size = 8M/post_max_size = 50M/g' /etc/php/8.1/fpm/php.ini

Then restart PHP-FPM.

sudo systemctl restart php8.1-fpm

Nginx also sets a limit of upload file size. The default maximum upload file size limit set by Nginx is 1MB. If you use Nginx, edit the Nginx configuration file.

sudo nano /etc/nginx/conf.d/mail.example.com.conf

Add the following line in the SSL virtual host.

client_max_body_size 50M;

Save and close the file. Then reload Nginx for the changes to take effect.

sudo systemctl reload nginx