Why I cannot use the search button in flipping book?

Q: I have downloaded your PDF to Flipping Book for a try. I read the introductions and glad to know there is search button that could search the content in PDF file. However, when I use, I find it doesm't work.

A: The search button in flipping book is for searching contents in PDF file. But it is on condition that your source PDF file is text format. If your source PDF file is image format or others, it would not work. So, before you use search button you should sure your source PDF file is text format, or it would not work.

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