Preview and PDF notes - wasted 2 weeks of notes.
I can't describe how angry I am. I am in the last year of my master degree, and I always used Preview to open up pdf lectures and write notes on them. Everything has always worked great, till the High Sierra update. Now, I can take all the notes I want, but some of the notes will be magically disappeared the next I'll open the pdf. Please tell me that it is a display error, and that they are not gone forever, or I'm lost.
MacBook Pro with Retina display, macOS High Sierra (10.13)