It seems that the function of importing data from ANSYS MAPDL/Workbench is inoperable, and this problem has been known for many years, as we see here: https://vtk.org/Bug/view.php?id=15160
It should be noted that the INP format is not a standard ANSYS format. Apparently, the import function works with a text file of the CDB format (renamed to INP), which contains the model building macro in the APDL language (but the file does not contain the calculation results). It is likely that @jose0233 managed to import some unusual model (perhaps it was created from legacy finite element types and created by an outdated version of ANSYS)
I suppose that today the most realistic way to transfer an ANSYS MAPDL/Workbench structural model to Paraview is to create text files of legacy VTK format from ANSYS using a macro in the APDL language. An example of such a macro is given:
- here https://stackoverflow.com/questions/41722822/how-to-read-ansys-data-files-in-paraview
- here https://pastebin.com/gyJHKTeJ
- and here (video with commentary in Czech) https://youtu.be/RmsM2JZNT7g