From the file picker, right-click on the file you want to remove and select Delete option from the contextual menu. In order to delete a project from Dropbox cloud, go to the File menu – Open – Dropbox. Right-click on a project and select Open in contextual menu.Select a project and click Open button.There are several ways to open a project from the Dropbox file picker: To access a project plan from Dropbox, click File - Open - Dropbox. Dropbox is a cloud storage and sync service available for Mac, Windows, and mobile devices.