How to upload photos and gifs
You can upload files to your event after the event. You can upload photos and gifs but you cannot currently upload videos from the dashboard.
Login to the dashboard, select the event you'd like to upload the content to. Scroll down until you see the drop zone. You may click within the box to Browse for your photo\GIF or you may drag & drop the content into the box.
How to delete files from your gallery
Login to the dashboard, select the event in order to delete the content. Click the trash can to delete the content.