ADE does that on PC also, if you open a book in ade, a new copy is created in the relevant docs folder
so I suspect that is not a CC issue, and not controllable.
there are better android readers anyway, try some of the free ones then buy the premium version of the one you like best... Moon Reader and Bookari are both good and do not create an extra book copy. [ bookari does only if you use the cloud feature, moon can sync to cloud but by default it only writes a last page read record, it does not copy the whole book ]
Bookari has built in support for adobe DRM if your books are not unlocked
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