deleteFile method
Deletes a file from the cloud storage.
Implementation
@override
Future<void> deleteFile(String path) async {
_checkAuth();
await _dio.post(
'https://api.dropboxapi.com/2/files/delete_v2',
data: jsonEncode({'path': _normalizePath(path)}),
options: Options(contentType: 'application/json'),
);
}