Downloaded ebooks lose their annotations when the download expires
Update 14.12.16 – A student has suggested a method of retrieving annotations from previous copies of ebooks downloaded from Ebook Central onto a laptop or desktop computer, which is described here.
When you access an ebook over the internet, annotations you make always remain available. If you download an ebook, however, the annotations you make through your ebook reader are made only to the downloaded copy; when the ebook download expires after 7 or 14 days, your annotations to the downloaded copy will vanish with it and there is at present no way to retrieve them. If you would like to make annotations that you can keep/export/share, we recommend using your online bookshelf through the online reader.