Split PDF pages in UWP

To split a PDF document into multiple pages.

PDFDoc doc = new PDFDoc(fileName);
int pageNumber = doc.GetPageCount();
for (int i = 1; i <= pageNumber; ++i)
{
    PDFDoc newDocument = new PDFDoc();
    newDocument.InsertPages(0, doc, i, i, PDFDocInsertFlag.e_none);
    await newDocument.SaveAsync(outputFileName + "_split_page_" + i + ".pdf", SDFDocSaveOptions.e_linearized);
}

Merge, Copy, Delete, and Rearrange PDF Pages
Full code sample which illustrates how to copy pages from one document to another, how to delete, and rearrange pages and how to use ImportPages().