Incorrect saving of PDF Annotations

What I’m trying to do

hi there. I’m new to obsidian. I created a file and annotated and higlighted a PDF within it. when i closed the app and opened it later on the annotations had been saved but the PDF itself was missing. it looks as if i had exported the annotations. any help?

Things I have tried

I’m not sure what to try

If the PDF was in your vault, did you search its name in the Quick Switcher? If it was outside the vault, did you search its name in your system’s file manager?