You might want to upload a nadir logo, your business logo and icon or anything else that has a transparent background. You uploaded it but realise that the software added a white background…
Here’s how to fix that:
Upload your image as usual
When selecting the image, make sure you choose “original” 
Now your image will be transparent.
Make sure the image size is exactly how you want it before you upload it as “original” images will be uploaded in the original size.