Files created by FileSystemStorage are well hidden. How would you recommend making them interoperable with the outside world?
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Apps are isolated from one another on devices, historically there were some ways around it (SDCard) but those are not as common even on Android. You can use the SDCard to store a file for Android and it will be visible and replaceable when plugging in the device.
iOS has the ios.fileSharingEnabled but it is relatively unintuitive as you have to connect the app via itunes to upload/delete files into the device.
I would use something like a https://www.codenameone.com/blog/native-file-open-dialogs.html[file picker] or the Dropbox integration to let users pick a file. To extract a file from the app I'd just use the share operation in Display.
