I am not an expert on adding PDF files to WT.
I created a free space page to upload images in Jpeg or Png. I am sure someone will answer you question soon. As I am almost sure it must me possible anyway.
If you do not get an answer soon repost or retag your message with Wikitree Tech.
Welcome at WT by the way! Wonderful you joined and found our G2G forum.
Sheldon we are all volunteers. Good thing is we are all equal. bad thing is answers might take a few sometimes.
Hope you re going to like it here as much as I do.
In case, and I do not think it very likely, but if you do not get help shortly, please post your message again with the tags I recommended you and/or send me a private message so I can get you some help.
Kind regards from The Netherlands,