The things in any library, embedded or not, appear only for the tools for which they were created. So, windows do not appear with the object or door tool, window labels not with any tool (but as part of the window/door settings), markers only as section/elev option...
Textures do not appear with any tool (but are used by materials or fills), and various objects do not appear with any tool because they are either macros, or are objects marked as "not placeable" (typically to define new parameter subtypes)...
Does the entry in your embedded listing look like something that should be placeable?
Cheers,
Karl
One of the forum moderators
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