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External screen

The External screen lets you set a custom external identification reference string that other apps and services can use when integrating with Matrix.

You access this screen through the Settings  External menu in the Matrix toolbar after loading an asset screen.

External ID

Specifies a textual identification reference string for the asset.
The identifier can contain any combination of a-z, A-Z, and 0-9 characters.
The identifier supports - or _ as separators.
Spaces are not allowed.

While an asset ID is globally unique in a Matrix system and a mirror ID is globally unique across any Matrix system, an external ID is unique for a set of assets, and can be reused within the same system.