Placing the file in the folder is not enough. You must tell your specific Plant 3D project where to look.
When you install AutoCAD Plant 3D, the software automatically installs the Imperial and Metric default catalogs. You do not need to download these separately. However, many users ask for a "download" because they accidentally deleted their path or need a clean backup. autocad plant 3d catalog download
Many valve and fitting manufacturers now offer direct AutoCAD Plant 3D catalog downloads. This is a massive time-saver because these parts come with exact part numbers (SKUs) for procurement. Placing the file in the folder is not enough