How to change securely an app attachment

Hi,

I want to update the version of several documents that are embebbed on an app, In Bonita 5.x I did this with the Bonita UserXP but in Bonita 6 this option is no longer avaliable, there is a way using the API or something for doing this?. The only way what I can use now is compiling a new version of the app, but this is not desirable in a production environment.

Thanks in advance.