Save File To Public Directory Using Cordova FileTransfer
Solution 1:
On Android, external storage directories always exist; if the device doesn't have a physical SD card, Android will emulate it. see getExternalStorageDirectory :
Note: don't be confused by the word "external" here. This directory can better be thought as media/shared storage. It is a filesystem that can hold a relatively large amount of data and that is shared across all applications (does not enforce permissions). Traditionally this is an SD card, but it may also be implemented as built-in storage in a device that is distinct from the protected internal storage and can be mounted as a filesystem on a computer.
Therefore cordova.file.externalDataDirectory will always resolve. However, for sharing data between apps, you probably want to use cordova.file.externalRootDirectory - External storage (SD card) root. See cordova-plugin-file.
This way you can store files in a place that's easier to access from another app e.g. /sdcard/my_shared_data/
On iOS, it's more difficult to share files because apps are intentionally isolated from each other due to security policy, as Apple's Inter-App Communication Guide says:
Apps communicate only indirectly with other apps on a device
You best bet on iOS is to share the data by synching it via iCloud. See the section Configuring a Common Ubiquity Container for Multiple Apps in iCloud Design Guide, which says:
... perhaps you provide two apps that interoperate and need access to each other’s files. In both of these examples, you obtain the needed access by specifying a common ubiquity container and then requesting access to it from each app.
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