You sure can. From the moment we start working on a design request, as soon as the first update is sent to you, you'll be able to access the editable layered files by going to the "design" folder of your ticket.   If you make changes on the file, please make sure to send it back to your account manager so we always have the latest updated file in case you need revisions in the future.   We currently work with Adobe Photoshop, Illustrator and InDesign only.