Application's access to the shared volume space has been blocked In Android 10. This was meant to protect data on the volume and to prevent its unauthorized access. By default, applications may only access the directory dedicated to the specific application, which is revoked, for example, during uninstallation.

This forced a complete redesign of the application in terms of disk resources usage. The key was to ensure continued access to interview files backups for users, so as to allow sending work results in the event of an emergency.

The solution involves asking the user in the CADAS CAPI application to select the cadas directory and to make sure that it is permanently accessible. If this directory does not exist, it shall be created it in the root directory. The questionnaire applications utilize a specially set-up access provider. Thanks to it, they may access the directory specified in CADAS CAPI.

If surveys have already been carried out on a given device, it is crucial to specify the cadas directory in the main directory. If another location is selected, the application will not be able to access previously completed interviews and they will not be sent to the server.

Incorrect selection will also make impossible to later send interviews from questionnaires created on earlier system versions.

If wrong directory was selected, the selection can be reset and the location reselected. To do this, go to the device settings and select: Applications -> CADAS CAPI -> Memory -> Deny access button. Next time the application is opened, the user will be able to select the location again.