The recommended way to work with Cascade images is to import them into the Cascade system before use. You can do this one image at a time or by zipping them and importing as a unit.
You should select which folder you'd like the file you're about to upload to reside in. For example, all images should be contained with the "imx" folder. This keeps the folder structure for your Cascade site nice and organized.
To bring in a single image, click on the imx folder and choose New from the menu. The "New File" window will open as shown below.
The "File Upload" fills with the image filename as shown below.
Click on Submit and the image file is now part of the Cascade site.