As @vb explained, tell it to itclude the entire doc.
use the prompt phrase ‘from the first page to the last page and do not change the wordings in the document apart from the specific instructions’.
I had a similar issue with Code interpreter, I gave it a simple task to rearrange my txt file in a particular format and while the phrase above got it to include the entire doc, it didn’t arrange them as I wanted even with several iterations of the prompt.