I’ve tried many times to edit and save changes, but changes to not save to the file. All the old data still remains and nothing I changed was saved.

I purchased the app and hoped it automatically changing the book title, cover and description. However, none of the above has been realized. I changed the title by typing in its real name and use an XL cover recommended by this app, and then clicked apply. I can tell there must be a change of my epub file because the book thumbnail in finder became sharper and clearer (the original cover picture was low in pixel) but when I tried to open it in ibooks, nothing was changed. The name was still wrong and the cover was its original one. It feels bad because the above is why I purchased this app. The 2nd bug, minor as it is, is slow reponse. When I drag the file onto the app, nothing happened. I tried it several times and finally got what I wanted. However, I love your idea about automatically searching and updating my ebook file metadata. I am looking forward to your update. Thank you.