Highlights and saving

[u/Bitter_Bin]

Hi, I seem to have a problem. I was unable to export my highlights in calibre so I decided to try converting the file to a pdf( don't ask me why the brain fart moment). Once I did that all my highlights disappeared. Now I'm only able to open it in the e book viewer via the browse annotations section, it's not available in the elibrary in calibre anymore. What do I do? How do I save the epub with highlights so it shows up in my library? And how do I export the file as a whole with the highlights (save to disk is not working for me)?

P.s no idea about any coding languages etc.

Pls help a bud out. DESPERATE.