Glad that you made it work as you wanted ! Indeed this may not be the best way since you’re wrinting your file to your disk. If you want to improve your workflow further consider the solutions I’ve mentioned in my previous answer.
Also if you have multiple timesteps for your velicity field, know that you can export your CSV files as timestep1.csv, timestep2.csv, timestep3.csv, … and when trying to open a datafile ParaView will group them and import them as a temporal dataset (see 2. Loading Data — ParaView Documentation 5.10.0 documentation).
If you think your issue is gone do not hesitate to mark this thread resolved 