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2. Verify that levels are named the same in both models. Read more Level Names Mismatch
Levels from linked model can be copied. Read more:
https://knowledge.autodesk.com/support/revit/troubleshooting/caas/CloudHelp/cloudhelp/2020/ENU/Revit-Collaborate/files/GUID-3B5AAC45-B5DC-48C0-8312-B90F06653F37-htm.html3. Set Attribute configuration for:
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