Encrypt checkbox missing on HR Case form after upgrade from Quebec to San diego

Hi Everyone,

we have upgrade our instance from Quebec to San Diego recently and after upgrade Encrypt checkbox for attachment is missing on HR Case form. 

we have assigned the role to user but still user is unable to see the checkbox to encrypt the attachment. Before upgrade it was working fine. Encryption plugin is enabled in our system.

Does anyone have solution for this issue ?

Thanks in Advance!

Regards,

Jyoti