Update specific attributes of an existing asset field using the update_mask parameter to control which properties are modified.

If update_mask=name, only the name is updated regardless of other values in the request body.
If update_mask=select_options, only select options are updated.
Multiple attributes can be updated in one request using comma-separated values: update_mask=name,select_options.
Any attributes not listed in update_mask are ignored, even if present in the request body.

When updating select options:

New options can be added to the select_options array.
Existing options cannot be removed or modified (to preserve data integrity on existing assets).
Total options cannot exceed 100.
Each new option requires a unique id and label.

Requirements

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Predefined fields (FIELD_TYPE_PREDEFINED) cannot be updated. Only custom fields (FIELD_TYPE_CUSTOM) created by your organization can be modified.