BookReader1

I know this question was already asked, and answered two pages earlier, but I doesnt solve my problem - because I think I setup everything correctly. Still, the container blows up (normal size of about 5 GB). I used a plugin within calibre to count the pages of books and during processing/running this addon, we size even went up to 15 GB But the books are not stored in the appdata folder / container disk, as suggested before. Is my setup correct? Thanks in advance!