Default [Q] select sdcard for download location on sony Z2 tablet

I have a new sony Xperia Z2 tablet with 64GB microsd. Now I would like to configure tTorrent, Sharedownloader and Chrome to download directly to the microsd. But I can not seem to get it working. In tTorrent for example I browse to sdcard in settings but can not select a folder. I tried

I also cannot create folders in sdcard.

What am I doing wrong?

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