Решение банально простое переходите в .htaccess и раскомментируйте данные строки
# 3. Set max upload file size. Most hosts will limit this and not allow it to be overridden but you can try
php_value upload_max_filesize 999M
# 4. set max post size. uncomment this line if you have a lot of product options or are getting errors where forms are not saving all fields
php_value post_max_size 999M
# 5. set max time script can take. uncomment this line if you have a lot of product options or are getting errors where forms are not saving all fields
php_value max_execution_time 600
# 6. set max time for input to be received. Uncomment this line if you have a lot of product options or are getting errors where forms are not saving all fields
php_value max_input_time 600
