You can only write to your own folder on the external SD card due to Google restrictions introduced in KK OS i.e. you can write to your application folder located under /external/Android/data . There is no restriction for the internal sdcard so you can read or write to any folder on under /internal .
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See this post.
https://developer.zebra.com/message/90797?et=watches.email.thread#90797
No way to write data to physical SD Card on Kitkat of TC55? how to overcome this situration? Please advise me.
You can only write to your own folder on the external SD card due to Google restrictions introduced in KK OS i.e. you can write to your application folder located under /external/Android/data . There is no restriction for the internal sdcard so you can read or write to any folder on under /internal .