I need to use the single-file attribute in the ng-flow, i have to use it because this attribute other than limits the nuber of file to send, substitute the file thate was added until the upload event, see this:

```
singleFile Enable single file upload. Once one file is uploaded,
second file will overtake existing one, first one will be canceled. (Default: false)

```

this is the documentation taken from flow.js git repository.  

What i really need to do is to put this attribute in the factory, because i need to set this for all my input file field. I have try to search it in the ng-flow documentation, but it lack of a lot of explanaion, anyone know how to do this? Otherwise anyone know where to find a complete good docummentation of this module?