Hello,
you need to add below thing into .htacess file
php_value upload_max_filesize 10M
php_value max_input_nesting_level 128
php_value max_input_vars 7000
If htaccess thing not work then you need to modify into php.ini file.
If it works for you then mark as solution.
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Sunil Patel
Magento 2 Certified Professional Developer & Frontend Developer