Hello,
The tech support guy said that I should check here to see if anyone knows the code to insert a url that links to a 3rd party database hosted PDF file and have it show up with the Issuu PDF viewer on my SquareSpace site.
(i.e.: utilizing something like the below url and embedding it so that it will show up with the viewer, thank you: https://issuu.com/designsourcemail/docs/newcovdrird_at-a-glance-c45-73881 )
Issuu apparently wants to charge us another $19/month to use their PDF viewer function for our PDF file (my client is a writer and it is very important for her to do this, fyi)