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Add If some of the metadata fields are not shown, you can click Add, and you will see all the non-displayed fields in that group. You can easily click to field name to make it visible. The Add button will be active only for the metadata groups that have non-displayed fields.
Filter Fields
Show Total Values in Case of Multiple Selection This is applicable for values which can be summed. When several assets are marked in the project area, fields like Duration, Age, View Count, etc. will show as a value the result from the sum of the values of all marked assets.