I have successfully created PDF using fillable PDF templates and PDFSharp. I convert the template using FormFields_SetValues to binary and then save it to a SharePoint site.
What I want to do is to merge several of these saved PDFs into one PDF. However, every merge pdf forge asset I've tried (including PDF Sharp) saves the PDFs without the fillable PDF data. It's all blank.
How can I save as, flatten, or convert these fillable read-only PDFs to a standard non-fillable PDF so the merge will include the fillable fields?
I switched to AppendPageToPDF. I get the fillable fields now, but it duplicates the first PDF on every subsequent page. I'll post a new question for that.