Yuxi, Yes InDesign looks at PDF as images only. When InDesign exports PDF to ePub you can select ORIGINALS or FORMATTED in the IMAGES window while exporting. If you select ORIGINAL all it does is put the PDF inside the images folder in the ePub and point the reading devise to the PDF because all devises can read PDF. If you select FORMATTED it converts the PDF into a JPG or GIF depending upon which one is selected. If left selected to AUTO InDesign chooses one for you.
If you import a PDF into InDesign it seems that it can only exported to ePub as an image or a PDF. So you need to extract the text from the PDF before you put the text into InDesign.
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