Dropbox has a device limit of three for free accounts, which refers only to computers and mobile devices with the official Dropbox app installed. This limit was introduced in 2019 and may not have been noticeable until users needed to add new devices. To work around this limit, users can remove unused devices from their account settings, upgrade to a paid plan that offers more features and storage, or use alternative cloud storage services like Google Drive, Microsoft OneDrive, or Apple iCloud. Additionally, users can consider using the web version of Dropbox on mobile or supplementing with another service for specific needs.