I just got unity and ive tried to import files from blender but all of them turn into pdf's please help!

I just got blender and unity personal because a friend said he would show me how to create modifications for open source games but now after my “preferred mode off delivery” screen bugged all my files that are being transmitted are now PDFs and I don’t know how to change it from adobe to something that will work please help me!,

@PeachCarton Sounds weird, but this site I found claims to convert PDF to FBX which can be imported into blender or unity.