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An attachment is any file that is included with your page. Examples of attachments are screenshots, photographs, other images, Word documents, presentations, PDF documents, videos and sound files. Attachments are useful when you want to share information that exists in another file format.
When viewing a list of attachments, you can add a new version of an existing attachment by uploading an attachment with the same file name, as displayed on the attachment view. Existing files will be kept with the name 'Version x', where the value of 'x' increments with each upload of an attachment with the same file name.
To see all versions of an attachment: Choose the arrow next to an attachment name.
Screenshot: Attachment versions
By default, attachments and their versions are stored in the <confluence_home>/attachments directory. (See Attachment Storage Configuration.)