I am using ArcGIS 10.4 and Data Driven Pages to create a 130 page atlas. The export to PDF works (exported to a single PDF), but the order of the PDFs seems to be random. There is an ESRI shapefile that serves as the index grid, and the records in this shapefile are in numerical order. Why does the export not export to PDF in numerical order? How do I get the PDF to build in numerical order without having to do it manually?