Is WRITE permission needed to edit a file in the ASD?

[bodymindpower (Anke)]

@Lollipop

to edit a file located in asd but trying to edit in any other app through activity starter?

This is not possible because the ASD is only accessible to the app with which it was created.
See here: Some basics on Android storage system

 /storage/emulated/0/Android/data/<packageName>/files/

which is in the External (private) Storage, but does not require READ_ / WRITE_EXTERNAL_STORAGE permissions. The ASD can only be accessed by your app and is automatically removed when the app is uninstalled.