i have solve the problem thanks for every one helped me

• the problem was on the '.htaccess' file

• i was't adding the size appropriately which is

<IfModule mod_php.c>
    php_value upload_max_filesize 100M
    php_value post_max_size 100M
</IfModule>

• the old form that didnt work with me

php_value upload_max_filesize 100M
php_value post_max_size 120M

*this one was proposed by Chat gpt