Zylpha Online Bundling contains a sort of feature which allows you to sort documents in a section by the following options:
Date (ascending)
Date (descending)
Name (ascending)
Name (descending)
Page Count (ascending)
Page Count (descending)
For example, to arrange the documents in a section chronologically, first click the "Sort" button at the top of the section and select "Date (asc)".
After sorting your sections, the documents will appear in this order in the generated bundle.