Orangescrum currently doesn’t allow for ad-hoc file uploads. All files have to be attached to the relevant tasks only. You can attach files to a task by visiting the comments section in the task details page.
Google Drive and Dropbox integration are also available out of the box with Orangescrum. You can link documents and files from your preferred account to Orangescrum tasks.
Learn more on how to integrate your Google drive or dropbox account with Orangescrum.