So a disclaimer before we start this, the purpose of this feature is so that you can avoid creating a number of pages with a single image as content and just upload a PDF to create all the pages in a chapter.
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If you're not planning to share the PDFs contents in this way then don't use the option of upload and split PDF.

Also make you a PDF as small as possible so that the upload process will be smooth and each page will load quickly. Here is an example again of an online tool which you can use.

So we now have the PDF file that we want to use as content for an entire chapter and we have compressed it so that is as small as possible and will be easily shared and each page will then load quickly.

The file example I'm going to use is a Microsoft PowerPoint presentation which will saved as a PDF, compressed and uploaded

Open your PowerPoint/Presentation file (your version of PowerPoint may be different) and select File > Save As

Select the File Format to be PDF

Now Export/Save the file. You now have your PDF created from your PowerPoint

Head over to https://smallpdf.com/compress-pdf if you don't have a tool like Adobe Acrobat professional or another desktop app, to compress the pdf. Now we are ready to upload

Step 1 - In your eLea rning select and expand the chapter which you would like to work with and select Upload & Split Pdf

Step 2 - Select the file to upload it

Step 3 - Wait for the processing bar to stop displaying, this can take a while based on the number of pages and the size of the file

Step 4 - PDF have been uploaded and split, into pages, you can select one of the pages to see how it displays

N.B. When you use the Upload & Split option, by default the page will be visible from the start date of the group which you are currently working in. So keep this in mind, especially when you may need to copy this chapter to another group later.