Be sure, developers are aware of this API, they are not behind it all.
This API works via file descriptors and through them it gives write access. Sync's core code works with files directly, the API doesn't allow it. That's why Sync is now allowed to write to SD card.
Since the API has allowed ES File Explorer to work without any problems, I don't see why it would prevent Sync from working. I can understand it is not easy to implement, but not impossible.
Sync Doesn't Have Permission To Write On Sdcard (Lollipop)
in Sync Troubleshooting
Posted
Since the API has allowed ES File Explorer to work without any problems, I don't see why it would prevent Sync from working. I can understand it is not easy to implement, but not impossible.