There are two reasons why this button may not appear for you or your end users:
Yes, in most cases, the embedded hyperlinks in your secured content will work. The links are fully functional with the secured PDF with Adobe or Acrobat application.
We recommend that you initially set up your Users (the recipients of your content) with a strong password, minimum 8 characters, and one that uses a combination of letters, numbers, and special characters.
We also recommend you select "Force user to change password" when you're adding Users into your Vitrium account as this way, the User can select their own password which may be more familiar to them.
For additional password controls, be sure to read more about our "Security Settings" in the Vitrium Security Admin Manual.