Cannot open acsm file in Android Digital Editions

I download some books for research to Digital Editions on my Win 10 PC. Being that ADE does not recognize my Samsung Galaxy S2 as a dedicated e-reader, I had to copy the files over from my PC. My ADE app does not show the books in the library, and when I try to open via the My Files app, I get "content not supported". I need these books for research and reading on my computer hurts my eyes, head, and neck. Help!