PDFs crashing and no longer opening on IPad

My Ipad Pro (OS 16.3) has stopped opening PDF files in the files app after crashing while I was highlighting a PDF.

I’ve force restarted the Ipad and updated it to the latest OS and still having this problem.

I really need a solution as I use this for reading and highlighting textbooks for my classes and it’s been like this for a week.

Other PDFs are fine until they to crash and stop opening.

Is there a fix? Please help