Upload a CSV file from Web IDE and parse

I'm making an app to load some sets of GPS coordinates (latitude and longitude) to the storage area by uploading from the Web IDE, using 4 disc icon, and then read those coordinates from the app and calculate distances.
Anyway, I made a CSV file in the Notepad++ with comma separated and saved with Unix LF option. Then I tried to read the data from the Web IDE console using following code, but didn't work.

var f = require("Storage").open("coordinate.csv","r");
var l = f.readLine();
while (l!==undefined) {
  console.log(+parseFloat(l.split(',')[0]).toFixed(6)); 
  console.log(+parseFloat(l.split(',')[1]).toFixed(6));
  l = f.readLine();
}

I found an app called 'gpspoilog' from this tutorial page, and used it outdoor to create a CSV file by the app and used the suggested read code from the tutorial and it worked fine.

From the storage file list (by clicking the 4-disc icon), I noticed the generated log file has a name 'gpspoilog.csv (StorageFile).csv (StorageFile)'

So, I guess there are some differences between the data file generated by an app and manually uploaded one.

I want to upload those GPS data manually and read them in my app. Is there any way to do it?

Thanks.