The view must contain a flat or cylindrical surface on which you can place decals. You cannot place decals in 3D perspective views.
Link panel
Decal drop-down
If no decals exist in the current project, the Decal Types dialog displays, and you need to create a decal type. See Creating a Decal Type.
The decal displays as a placeholder in all non-rendered views, as shown. When you move the mouse over the decal or select it, it displays as a rectangle with a cross through it. The detailed decal image is visible only in rendered images.


3D view showing placeholders for decals
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