Not sure. I want exactly the opposite. I don't want my books scanned - with 512 GB card and possibly hundreds of thousands of books it would take so long, and the result would be a mess.
And I don't use Calibre to manage or to transfer books either.
Calibre is a toy. It is written in python. It chokes on a big number of books.
I know because I tried it on some fraction of my books and it choked completely.
Python is a slow interpreter. It is perfect as a calculator, though.
So I am using a hierarchical multi-level folder structure instead.
Come to think of it, there are powerful and fast book management tools for PC, such as MyHomeLib.
Perhaps for android too? I will have to look.
At the moment I have only 6.01 devices, the one that I upgraded to 8.1 - I gave it to my sister. Everything might be very different in 8.1. I will have to convert to 8.1 another one.
So in 6.01 there are two options for the paths to books: Books and root. Not sure, but possibly in the internal storage only. I am not interested, so I never tested, I deliberately named my folder Bookz so that it is not found.
In case the books on the card are not scanned, you can still find them.
• Use the default file manager (already installed on your Alita).
With the file manager, navigate to your book, tap on it, and it will open in the default reader.
• Open Notifications, see your card there. Tap on Explore. Find your book. Tap on it.
Then your recently opened books will probably appear on the desktop or somewhere.
I don't remember that either, as I am using Cool Reader and it has its own internal recently opened book list.
Well, you may ask me later. I will have to explain things to my sister, so I will have to update to 8.1. and I will have to learn to use the default reader myself.
Currently all the books I am reading do not require the default reader - they are not pdfs.
So Cool Reader can handle them.
BTW, Cool Reader has its own internal file manager - so there is another way to open books.
I just launch Cool Reader and then never get outside it. GoldenDict is integrated with Cool Reader, so I have full access to multiple dictionaries and encyclopedias without leaving Cool Reader as well.
Cool Reader is like my OS GUI

But Cool Reader does not handle pdfs.