Hi Jonathan,
I recieved your test files. Thank you very much for sharing them. It looks like the file you shared is not actually a PDF Form, but it's a flat PDF file. You'd have to use a product like Acrobat Professional to add fillable fields to the form. There is a feature that we're considering for a future release that might help you fill even flat forms. Please watch for updates!
Thank you again for sharing the files.
Pat
