Improve "Selected file contains multiple footprints" string.

pcbnew/pcb_io/pcb_io.cpp

@@ -2,7 +2,7 @@
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
  * Copyright (C) 2011-2012 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
- * Copyright (C) 2016-2023 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 2016-2024 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -119,7 +119,9 @@ FOOTPRINT* PCB_IO::ImportFootprint( const wxString& aFootprintPath, wxString& aF
     if( footprintNames.size() > 1 )
     {
         wxLogWarning( _( "Selected file contains multiple footprints. Only the first one will be "
-                         "imported." ) );
+                         "imported.\nTo load all footprints, add it as a library using Preferences "
+                         "-> Manage Footprint "
+                         "Libraries..." ) );
     }
 
     aFootprintNameOut = footprintNames.front();