Hi, I purchased the Chinese History ebook through Pleco and it is great. I have some Mandarin study PDFs that I would like to be able to read through the Pleco Ebook Reader as well but can't figure out where to put them so the Ebook Reader can access them. At the moment when I select the Ebook Reader only the Chinese History displays on the drop down list. Is it possible to put my study PDFs into Pleco Ebook Reader? I am using a Boox Max2.