Allow the "Page Number" field to accept more than one page number

When logging issues on a PDF, there is a "Page Number" field where the user can indicate which page of a PDF document the issue occurs on. However, it is not possible to enter more than one number in the field.

The impact is that if an issue occurs on multiple pages of the PDF, the user has to decide if they will log a separate issue for each page (time consuming), or state in the issue description which pages the issue occurs on (e.g. "Occurs on pages 1, 3, and 4") and leave the "Page Number" field alone (could result in the page numbers being overlooked).