-Certain system tables and all custom tables support entity images. Those tables that do support images can contain both a thumbnail and a full-size primary image. The thumbnail image can be seen in the web application when viewing the form data. There can be multiple image columns in a table but there can be only one primary image. However, you can change the primary image from one image to another by setting [IsPrimaryImage](https://docs.microsoft.com/dotnet/api/microsoft.xrm.sdk.metadata.imageattributemetadata.isprimaryimage?view=dynamics-general-ce-9#Microsoft_Xrm_Sdk_Metadata_ImageAttributeMetadata_IsPrimaryImage) for that column to `true`. Each full-sized image column is limited to 30 MB in size. The <xref:Microsoft.Xrm.Sdk.Metadata.AttributeMetadata.SchemaName> of the entity image column is `EntityImage`. More information: [Entity images](/dynamics365/customer-engagement/developer/introduction-entities#entity-images).
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