First, select the project you want to upload a 360 image into. Once you're on the project details page click "Add 360 Image."
You will be prompted to select whether your 360 image consists of one or two images. Most formats will be in the form of a single image. If you're uploading from A360 you will need to upload the left and right images separately.
To view your images click "Start 360 Presentation"
To share the images to a phone simply click the "Share" button on the left side of the screen.