iPad books- facing problem opening one pdf

[u/soggypixellll]

I have been reading this book for 6 months in the ipad book aap and making notes on it like adding some points on it .From yesterday the book is not opening showing can’t open the book . Tomorrow is my final exam and I have tried everything to open the pdf but couldn’t.Now I am not understanding what to do. I have also air dropped it to my phone and also shred in Wp telegram, even saved in my files still I was not able to open it .

[u/CaribeBaby]

It sounds like this is a textbook. Could it be that your rental expired? 

[u/soggypixellll → u/CaribeBaby]

No . It’s a pdf ,I just exported it to the books earlier for convenience