After entering a new listing, you will have the option to Add/Edit photos from the Input Succeeded page. For existing listings, you can manage photos by going to the Input page, choosing the listing, then selecting Manage Photos from the list of options.

Once you reach the Add/Edit photos page, click Browse to upload photos from your device into Matrix. Accepted file types are .jpg, jpeg, or .gif. 

Once uploaded, add the descriptions and captions for the photos then click Certify and Save to finalize the upload of the photos.