Difficulty viewing sent document when trying to sign on phone

Difficulty viewing sent document when trying to sign on phone

Hello,

We are just getting started on Zoho Sign.  I am experiencing no issues sending a document to myself, or completing a document when I view it on a computer.  However, when I try to complete the same document while viewing on my phones email inbox, it is extremely difficult to determine what the fields are asking for - so much so that it nearly renders the application useless.  

Is there a step I am missing?  Some sort of compatibility issue for viewing on mobile?

Thank you in advance for any information.