Starting with version 2.3 Sync has implemented support for External SD card on Android utilizing DocumentProvider API. This made it possible for Sync to get write access to SD card on mobile devices with Android v5.0 and newer.
To save your folder on SD card, you need to disable "Simple mode" in Sync settings, so you can pick folder location 'On SD card"
Seeing this view means that writing to SD card is possible on your device.
Possible issues with access to your SD card
- You do not see the option to store folder on SD card, but instead see regular Sync's folder picker, i.e. writing to SD card is not possible!
Open "Contact Support" menu, in the E-mail field instead of your mail address type SNC.DBG.SD and hit "Send" (envelope icon), at the bottom of the screen see if your SD card is listed as available storage. If not, type SNC.DBG.SD.ENABLE and also hit "Send". Try using the SD card again.
- You still get 'No permission to write to selected folder" warning.
Make sure that you pick SD card via the above mentioned view. Do not navigate to the SD card through picking "On phone"-> level_up -> storage -> SD_card. Such method is not using the API and thus doesn't grant access to the SD card.
- You cannot create a new folder on SD card to back it up.
That's right. You can pick any existing folder as a backup folder, but creating a new one is not possible through Sync. Solution: create a folder using your file manager, and then pick it in Sync.