Add Global Variable in Profile (āG_fileNameā).
Add Local Variable (āfileā - to match yours URL) in request definition (Object Repository) and set type āGlobal Variableā. Select Global Variable, created in 1. in Default Value. This will link Local with Global.
Loop in TC.
Code not tested, it is just idea:
import com.kms.katalon.core.testdata.TestDataFactory
import com.kms.katalon.core.webservice.keyword.WSBuiltInKeywords as WS
myData = TestDataFactory.findTestData('listOfFiles')
myData.allData.forEach()
{
GlobalVariable.G_fileName = it[1] //Yes you will get array
res = WS.sendRequest(findTestObject('fileRequestName'))
//Do what you need with res
}