I am not able to highlight text in a PDF book that is not in English language. Any help
Try reading the book in some other pdf reader, like Adobe Reader or GoodReader.
It may be that the pdf was created in a way that makes this iimpossible. Try getting the book in another format.
Is this because the highlight feature is only for English books?
Some pdf's may not allow highlight, regardless of language.
Did you try Adobe Reader?
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