There seems to be a glitch in the preview on iOS ( haven’t tried the other operating systems)
I used the table on content option. In preview when I press a header link the whole document window goes blank. The only way to get it to return is to select a different document and then return back to the original document and the text reappears but the header link still do not work. I rebooted the app and the device tried both mobile and tablet still the same issue.