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I am a bit confused with what you are doing are you sending books using calibre companion to your phone or using a usb cable.
If with calibre companion then with root you can use an app like foldermount it will make the android os and calibre companion see external sd or a folder in external sd as a folder in internal sd card.
And if you are using usb cable just send books to the external card once you have set the foldermount to emulate it in internal when you open calibre companion you will see the files as usual.
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