Edit .htaccess file
php_value upload_max_filesize 128M php_value post_max_size 128M php_value memory_limit 256M php_value max_execution_time 300 php_value max_input_time 300
Or
Edit wp-config.php file
@ini_set( 'upload_max_filesize' , '128M' ); @ini_set( 'post_max_size', '128M'); @ini_set( 'memory_limit', '256M' ); @ini_set( 'max_execution_time', '300' ); @ini_set( 'max_input_time', '300' );
References
https://help.servmask.com/2018/10/27/how-to-increase-maximum-upload-file-size-in-wordpress/