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When a document is updated (for example, its associated file or properties are changed), its internal version is incremented and the data of the previous version is saved in a version history table.
You can visualize the previous versions of a document at any time or you can download the file that corresponds to an older version of the document. Also, if you have Edit permissions, you can restore one of the previous versions of a document.
By restoring a version, a new version is created with the data from the version that you chose to restore.

Version history only applies to documents; folders do not have internal versioning.

Viewing the previous versions of a document

Follow these steps to view the previous versions of a document:

In Jira, go to Projects
Make sure you are on the right project
Click the Documents tab
Locate the document and click on its Previous Versions option under the Actions menu. The Previous versions for... window will be displayed, showing the list with the previous versions of the document on the left side and the data of the selected version on the right side

In the list with the versions on the left side, click View to select a version and visualize its data on the right side of the window
In case of a File type document, you can download the file associated with the selected previous version by clicking the link with the name of the file

Restoring a previous version of a document

Follow these steps to restore a previous version of a document:

In Jira, go to Projects
Make sure you are on the right project
Click the Documents tab
Locate the document and click on its Previous Versions option under the Actions menu. The Previous versions for... window will be displayed, showing the list with the previous versions of the document on the left side and the data of the selected version on the right side
In the list with the versions on the left side, click View to select a version and visualize its data on the left side of the window
After selecting the version that you want to restore, click the Restore Version button. A message with the result of this action will pop up at the top of the page

The Restore Version button is not visible if the user does not have Edit permissions or if the document is locked for editing by another user.