Hi, I am not able to see your video.
Hope you have follow below steps, please correct me if wrong.
You have applied the Isoline mesh control to a CAD body and generated surface mesh on it.
Then you have modified the existing Isoline mesh control that applied on CAD body and you have tried remeshing corresponding FEM faces. this wont work.
Because, the modified mesh control still is on CAD and you remeshed FEM faces. For this case, you have apply a new isoline mesh control on FEM faces and then perform remesh for those faces.