I recently exported PDF exhibits from ArcGIS Pro 3.0. An engineering collogue used the PDFATTACH command in Civil 3D as he usually does to attach PDF. He found that the PDF's would not attach and Civil 3D gave no error messages.
PDF's exported from ArcGIS Pro prior to the 3.0 update and any other PDF's are able to be attached without any problems.
Any thoughts or advice would be greatly appreciated.