A post with some information that might help others. This regards, Revit 2020.
Ran into an issue where we could not add some materials from a library (.adsklib) into the project. Also duplicating some materials did not work. No errors or warnings just not doing it. Adding the materials by double clicking, dragging, using right click menu or using the arrow icons all did not work
After some troubleshooting the issue appeared to be in the material names. The materials that did not work contained square brackets "[" and "]" in the material name.
This issue did not happen in Revit 2019 (and earlier?).
Issue was resolved to open the Material library in 2019 and renaming all the materials with square brackets.
Louis
Please mention Revit version, especially when uploading Revit files.
I am facing the same issue so kindly guide me how to fix it .I mean how to apply a certain material to my project
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