When I’ve inserted and linked in my model via Revit / Datasmith and save and close the file, the next day random objects have disappeared causing me to have to reimport the files and start the material changing process again.
So I understand that the last thing you did before closing is saving correct? In that case, are there some commonalities among the assets that are missing? part of a group or a specific hierarchy that could be a path to investigate? Let me know 