Pivot Regenerate button not visible to portal users

we have two permission settings i.e 'user permission ' & 'portal user permission' and both have the same setting that we enable for our users, Now those who have access to user permission can see a button on the pivot table, "regenerate" but those who have access to the portal user permission are unable to view
what is the reason?

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How to Add Users to your Organization in ZohoMail?
A better clarity so you can create other users to start using Zoho Mail. You can directly Add Users from the Control Panel to your Organization. You can invite users with the existing email address. If the person (user) already uses ZohoCRM, then you can import users from Zoho CRM. You can also import them using a .csv file. (if you are planning to add them in Bulk) In this topic, We will be discussing on how to Add and Invite users only. The Import options are self explanatory. ____________________________________________________________________________________________________________