Step #1
Create JSON file and download

Step #2
(Locally) Open JSON and check filename, then rename your CSV-formatted waveform data.

Step #3
Upload your CSV-formatted waveform data for all channels.
Note that the .CSV has 3*N+1 columns,
with time(s), UD(ch1), EW(ch1), NS(ch1),UD(ch2), EW(ch2), NS(ch2),... etc.