i had this issue on IOS. Vexing to to say the least. I find the instructions on https://help.evernote.com/hc/en-us/articles/209005587-Annotate-images-and-PDFs vague and presumptuous. It would appear we are to press and hold the pdf with our finger, then and ONLY THEN will the option to annotate appear. I don't recall the last version behaving in such a manner and the current documentation doesn't quite gel with the current version of the software...no matter. I fixed t.