Press the ctrl key and click to select multiple files.

Name your files by number before dragging to the uploader. It will save time when arranging them. For example: 1.jpg, 2.jpg, 3.jpg, and so on. 

Wait to click Continue until the file upload is finished.

Requirements:

Your photos must be high resolution, at least 1400 pixels wide, to produce a high quality image.

Your photos must be bright and clear, in focus images. Check that they look good on screen.

Use photo editor, Adobe® Photoshop®, or similar to fix them. These usually came with your camera.