You can add an image to image hosting by either uploading a file from your computer or importing a file that is hosted elsewhere on the Internet. Images you add will be stored in your image gallery and ready to be included within your campaigns.
First, open up your image gallery. To upload an image, select 'Upload' at the top of the window. Click 'Choose File' and select an image from your computer. Then, hit the 'Upload Image' button. To import an image that is hosted elsewhere on the Internet, select 'Import' at the top of the image gallery window. Enter the URL where the image is located and click 'Import Selected URL'. Acceptable file formats for images are JPG, JPEG, BMP, GIF, and PNG.
After you've added your image, scroll down to the bottom of your images. Your newly added image will appear as the last image.