How to customise the slide background

You can use any background for your Presentation.

Follow these steps.

First, save your desired background as a file.  

Allowable picture file types are JPG, JPEG, PNG, JPG, WEBP, SVG>Save As and choosing 

As an example, you can save a PowerPoint slide using File>Export or File>Save As.  Then select JPEG or PNG as your file type.

Next, upload as a "Background" in ScaleXP.

Click into your Presentation.

Select “Background” at the bottom of the slide.

Click to upload your image.

The image will automatically be applied to that slide.

Click “Reset” to remove it from the slide or 

Click another image instead;

Whatever action you choose for that slide, the new image will remain uploaded until / unless you select “Delete.”

This is now available for use in any slide within that presentation.

Select the background for each slide from the ones you have uploaded and you are set to go!