trying to restrict gallery page

Hello gemchand.

If your gallery content is outside of WordPress this blog post should help. Locking Down Non-WordPress Files and Folders with Paid Memberships Pro, here:
https://www.paidmembershipspro.com/locking-non-wordpress-files-folders-paid-memberships-pro/

You can also use the Shortcode on the gallery page to verify that you are restricting access. https://www.paidmembershipspro.com/documentation/content-controls/with-shortcodes/

Please let me know if you need further assistance.