Load or download a file from a process and file name
loadFile(json_data, processName, fileName, sep = "\t", download_dir = getwd())A data frame with the file contents if the file is tabular; otherwise, NULL after downloading the file.
The `JSON` object containing the report data.
The name of the process.
The name of the file to load or download.
The separator for tabular files. Default is tab-separated.
The directory where non-tabular files will be downloaded.