It is tracking my uploaded epub’s for me but I think you need the metadata to be right for it to know what book it is.
https://preview.redd.it/e393h7i2643c1.jpeg?width=1050&format=pjpg&auto=webp&s=8ee82c6697cb4a2ee6cd29f2852c435bb82dd2f1
I may be the only one….
It is tracking my uploaded epub’s for me but I think you need the metadata to be right for it to know what book it is.