addFilesSync method
Implementation
RequestFormBuilder addFilesSync(String key, List<RequestFileItem> files) =>
this
..data.files.addAll(
files.map((item) {
final value = MultipartFile.fromFileSync(
item.filePath,
filename: item.filename,
contentType: item.mediaType,
);
return MapEntry(key, value);
}).toList(),
);