Hi everybody

For my studies I have downloaded dozens of books from my university’s library as PDF. Until recently I have uploaded them to my Kindle app and managed them there, which was fine. Now there are problems with creating collections locally and it sucks.

Anyway, I found Zotero and uploaded my PDFs there. Most are being displayed perfectly, but a few are completely unreadable (see link). I have tried other readers and all can work with those files without issues. Do you have any idea how to solve this?

Thanks for your help.

https://postimg.cc/QVkDfdrj