How to make the page number in a PDF file match with the one inbuilt in the app? I have a PDF file, which shows page numbers after a few pages, like preface, index etc. However, I use the Drive PDF viewer, which starts counting pages from the preface page itself. Is there anyway, to make it start counting after a few pages, so that to match it with the book itself?

This maybe an off-site question, so instead of downvoting, please suggest me where else to post this question.
Three options


Splitting the PDF file
Rearrange pages in PDF
Open the file on your PC to edit and transfer it your Android - not tried by me


There are many apps , ( thanks to Izzy)
that can do the first two options, but I would recommend Xolo PDF reader and editor which is versatile in handling PDF files. Besides, you can export edited files to drive.  


Deletion:  You can delete those initial pages and export to drive or a different location in your device ( warning: make a copy of original file and use the copy to edit, since changes are permanent)
Rearrange pages: Select and drag the pages you don't want ( for instance pages with Roman numbering and put them at the end of document ). Save and export to Drive or use Xolo. Note- This is a feature which is free in this app unlike a paid option in other apps