You have linked a model into the current project, but you cannot see the linked model in some views.
Issues and Solutions: To determine the source of the problem and resolve it, try the following:
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Reveal hidden elements: Open the view in the host model and click
(Reveal Hidden Elements) on the View Control Bar. The drawing area displays a magenta border, and hidden elements display in magenta. If the linked model displays in magenta, right-click it, and click Override Graphics in ViewBy Category. On the Revit Links tab of the Visibility/Graphics Overrides dialog, select the check box in the Visibility column for the linked model.
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Check display settings: If the Visibility setting is already turned on for the linked model, check the Display Settings column of that dialog. If it is set to By Linked View or Custom, click the value to display the RVT Link Display Settings dialog. Check whether the selected linked view, view filters, or other settings might prevent the linked model from displaying in the host view.