This property editor is appended to the Image Clip Property Editor, instead of the Image Source Property Editor, when you edit the image used by a shader that writes a texture image rather than reading one - the Color Sampler, Sub-Surface Lightmap Write, mib_lightmap_write, and misss_lightmap_write for example.
To display: Choose Modify Texture Your texture, then expand the Sources and Images icons and click on your texture's icon.
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