Connect eBook reader to android phone Adobe Digital Editions ADE

I want to download a DRM ebook from a public library to my android phone ADE (4.5.11). Then I want to connect my ebook reader with an OTG-USB ( on the go ) cable to my android phone. I would expect a similar behavior as with the procedure with my notebook (ADE recognizes the ebook reader, I can transferr ebookt from ADR to the reader).

But in my android ADE the ebook reader is not recognized, so I can not transferr the ebook to the ebook reader.

What can I do?