Why still a 1mb upload limit?

My setup at https://www.arts.uk.net has the following files and settings:

ht access file is:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule . index.php [L]

RewriteCond %{HTTP_HOST} !^arts.uk.net$
RewriteRule ^(.*)$ https://www.arts.uk.net/$1 [R=301]

RLimitMem 128000000

The final line is for the memory setting of the apache server

There is a php.ini which has this:

upload_max_filesize = 200M ;
post_max_size = 200M ;
max_execution_time = 600 ;
memory = 125M ;

And I have a setting at the top of the wp-config that sets memory thus:

define('WP_MEMORY_LIMIT', '125M');

So why on earth do all the media upload/insert interfaces say, and enforce, that the file size memory limit is 1mb?

Have I missed something ever so basic?