how-to-increase-maximum-upload-file-size-in-wordpress
1. Update .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
Change the numbers to the values that you need. The max execution time and max
input time values are in seconds and might need to be increased further if
your internet connection is slow.
2. Update 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' );
reference :
https://help.servmask.com/2018/10/27/how-to-increase-maximum-upload-file-size-in-wordpress/