Combining Fillable Form PDFs with a PDF
I am using the latest version of Adobe Acrobat 64-bit (25.001.20435). I have a short manual (35 pages) that I wrote in MS Word and saved as a pdf. I have several fillable forms that I created in the same version of Acrobat. When I combine the 4 fillables forms with the manual, some of the fields become unfillable in the combined file. They are fillable in the individual pdfs. For example, all the fields in this screen capture should have checkboxes:

Is there a setting to prevent the fillable fields from being removed?
Thanks.
