Yes! Once you’ve started your contest, you can attach files to the brief.
1. Click 'Brief' on your contest page
2. Uploading Files — There are sometimes two ways to do this, see below:
• Logo Contests: Drag and drop logos that you want the designers to use for visual inspiration under 'Visual Style' - 'Design Inspiration'.
• All Contests: Drag and drop files into the 'References' - 'Attachments' area closer to the bottom of your brief.
And that's it - the images should appear for you and save automatically!