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Tips and Tricks
From Dropbox Wiki
This portal talks about tips and tricks discovered while using Dropbox. Articles may use technical language. Tips and tricks could vary from interesting workflow combinations involving Dropbox to unique uses for the application.
Tricks within Dropbox
Old style photo gallery No longer supported. Existing gallery views will be converted to shareable links after Oct 8
Removing Dropbox links via the mobile app - You can do so by simply renaming the file on your device. This will break the link. Caution: Links will re-activate once name is reverted
Exclude folders from syncing - Selectively exclude folder/s from within your Dropbox folder from syncing to the cloud.
Release Notes and all Builds - Access previous versions of the desktop application. You can see the all the stable and experimental builds here.
Cross Platform / Web
Small webcam server with Dropbox upload - Upload your webcam pictures directly to Dropbox using a small pocket router with USB port.
Backup Box - Automatic scheduled transfers between your FTP or SFTP servers, Box.com, MySQL and other databases, Microsoft SkyDrive, Google Drive, and Dropbox accounts.
Sync Two Dropbox Accounts on the Same Machine Works for both Mac OS X and Windows.
More Cross-Platform/Web tips available at Cross Platform Tips And Tricks
You might also want to check out Dropbox Addons for details on third party extensions to Dropbox.
More Linux tips available at Linux Tips And Tricks
More Windows tips available at Windows Tips And Tricks
Mac OS X
Monitor for conflicted files using GeekTool (Mac OS X)
An AppleScript and an app to help you find conflicted files (for Mac OS X)
More Mac OS X tips available at Mac Tips And Tricks
Add PDFs to iBooks using Dropbox Supports iOS
Print Files from your Mobile Phone Supports Android, iOS, and all other mobile devices.
Forum thread containing various tips and tricks for Android