you can use the Properties tool in DataLink ribbon. Then select the tag to check and the property to show.
If you want to daonwload all tag's attributes or all the properties of an AF entity you should better use PI Builder coming with AF client package.
Hope it helps!
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You can use PI Builder to pull in configuration information for both PI Points and AF Elements / Attributes. Check out this video for more info - OSIsoft: Create, Edit, & Delete PI Points (Tags) in Bulk with PI Builder [v220.127.116.1137] - YouTube
Essentially you'd search for the PI Points you'd like information on, and then chose which properties you'd like to see, such as engunits: