How to load Schedule:File in OpenStudio?

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I read some posts and see the "schedule:file" works in OpenStudio now. Is there any example measure? I write the following codes (from another post), but it always returns "Error: File could not be found and can not be assigned to ScheduleFile objects". Is it because of the file folder, or some formats? Thanks~

The code is as follows

ext_file = OpenStudio::Model::ExternalFile::getExternalFile(model,"/Users/name/Desktop/hourly_values.csv")
if ext_file.is_initialized
  ext_file = ext_file.get
else
  puts "Warning, could not find file"
  runner.registerError("File could not be found and can not be assigned to ScheduleFile objects")
  return false
end

I would like to import pre-calculated HVAC plant load profile, from csv file into OpenStudio, I found "Load Profile Schedule" object in tab Schedule/Library (OS 1.0), but didn't find a way to to import csv file. Maybe I'm wrong when using this object, or someone can help.

I have Load profile schedule here, but I dont know how to link between them to get proper data for plant simulation, simply in the image below. They have the same name: Schedule From File, I'm not sure it's good or not

https://imgur.com/eyMauXm

https://imgur.com/Q3yhXrk

https://imgur.com/PGsbcTj

Thanks.