PDFs in iBooks - Sync via iCloud?

i've tried googling , mroogling 1 still can't seem find clear answer, here goes...

should pdf documents have in ibooks syncing between devices via icloud - i.e. in same way books ibookstore do?

if so, how enable this? if not, suggestions on how achieve can sync stored pdfs on iphone , ipad?

in advance

 

anyone...?

 

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