Add get_pdf_filename() to API

[jakejackson1]

Description

WIP

Testing instructions

Screenshots

Checklist:

• I've tested the code.
• My code is easy to read, follow, and understand
• My code follows the accessibility standards.
• My code has proper inline documentation / docblocks.

Additional Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.07%. Comparing base (73750a2) to head (834ef18).
Report is 2 commits behind head on development.

Additional details and impacted files

@@             Coverage Diff              @@
##           development    #1558   +/-   ##
============================================
  Coverage        76.07%   76.07%           
============================================
  Files              248      248           
  Lines            12993    12993           
  Branches           370      370           
============================================
  Hits              9885     9885           
  Misses            3100     3100           
  Partials             8        8           

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