What is the general goal of the feature?
An intent based widget where the external app would return a file.
What are some example use cases for this feature?
We are doing some advance surveying/mapping in an external widget, during the surveying some raw gps logs are downloaded to the app, those logs are then zipped together and should be attached to the submission.
What can you contribute to making this feature a reality?
We can provide an implementation in a PR.