Bookmarks workings using calibre e-book viewer with EPUB file

My understanding is that bookmarks are saved the EPUB file itself.
I created bookmarks on an EPUB book under Adobe Digital Edition (both highlighting some text in the book and adding notes as allowed under Adobe DE).

I added the EPUB book to Calibre:
- none of the bookmarks (nor text highlighted area, nor related notes) have been read by Calibre.
- when i highlight an area of text in Calibre e-reader, save it and then come back to it clicking on the link in manage bookmarks, it brings me back to the page but does not keep the area of text highlighted!

Are the above linked with my novice knowledge of Calibre?
Any known fix of plug-in?

If the above is indeed a weakness of Calibre, as a new user of that software to maintain my ebook collection, it is a major put off as for me a major plus of ebooks is not only to highlight (bookmark) interesting parts of a book but also to thereafter quickly browse over the various bookmarked area as a way to synthetise the most important statements but also quickly find the exact quote previously highlighted via keyword search!

Can anyobe guide me as to how to optimise bookmarks usage on Calibre? (As i did not find any info in manual nor forum questions)

Thanks in advance

Eric