View-only permissions also apply to mobile devices. Members will need to have the following versions of the Dropbox mobile app for view-only permissions to take effect:
"View-only conflict" folders are created by the Dropbox application to ensure that any files you've worked on are not deleted. If you have view-only permissions on a file or folder, you won't have the ability to modify the contents of any shared folder that has a lock icon on it. Instead, if you attempt to modify any files or add any files while the Dropbox application is turned off or uninstalled, the next time Dropbox starts it will perform the following steps:
This process ensures that your changes are saved and ensures that files are not modified for any other member of the shared folder.