Check list
Apache/2.4.52 (Ubuntu) is Present
PHP 8.3.16 is present.
Your videos directory must be writable
The video directory does not exists, AVideo had no permition to create it, you must create it manualy!
Then you can set the permissions (www-data means apache user).
sudo mkdir /var/www/html/AVideo/videosThen you can set the permissions (www-data means apache user).
sudo chown www-data:www-data /var/www/html/AVideo/videos && sudo chmod 777 /var/www/html/AVideo/videos
Your post_max_size is 16G
Your upload_max_filesize is 16G