Import from CSV option is missing next to Manage Attendees

Hi friends, can any one help me with this.. 

After creating a Webinar in Zoom Web Portal, I was trying to Import the Registrants so followed the instruction on the article (link given below) . There under Invitations as I did Scroll to Manage Attendees and as I tried to click Import from CSV. The very option "Import from CSV" is missing. Kindly guide me..

https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0065473