ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMMultiLayerSymbol Class / ThumbnailURI Property

ThumbnailURI Property (CIMMultiLayerSymbol)
Gets or sets the representative image of the symbol as a base64 encoded string.
Syntax
public string ThumbnailURI {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also