How to set the "temporary transcoding" folder to microSD?

Hi there,

i just added a 64GB microSD to my shield and formatted it as internal storage (but moved nothing over as of yet). After that i logged into the shield to get the correct path to the MicroSD which is:

/internal/SanDisk

Question: I just entered this path into the Settings->Transcoder->Temporary Transcode Folder but it doesn't work...

What am i doing wrong? Do i need to move everything over to the SD-Card first? Is the path wrong?

Thx!