Blank pages after adding other pages

Hi everyone,

I urgently need help... I had this big file for a project I have to hand out in a week.

I added some pages in the document from another PDF file and then suddenly all the other pages went blank (except from the ones I had just added).

So now I have this file, size of 30 Mo with only blank pages (except the ones I had just added from another PDF file for which the size was 500 Ko...).

I tried everything, the pages remain blank even if I open the file with another software (Preview on Mac or web).

I extract some pages from the document in attached, 10,4 Mo but still nothing ...

I have Adobe Acrobat Pro DC version 2018.009.20050 on my mac OSX version 10.13.6.

Thanks and sorry if my English is not perfect or if I did not explain the problem well 🙂

Would be happy to answer your questions !