You can merge multiple files into a single PDF file.

1. Open Save2PDF and either tap on a file or other item to view it, or check the file/files you wish to convert
2. Tap the PDF button in the top right corner
3. Rename the file if needed then Tap "Save" and choose the location you wish to save the PDF

If you only want certain pages to be included from a specific file, tap on the "All Pages" link and choose the page range
To add further files tap the + button on the top right
You can change settings such as margin, scale and orientation next to each file.

You can also convert files from online storage (i.e. iDisk or WebDav enabled stores). Open into your Cloud server in the Files screen, check the items you wish to convert and follow the steps above.