Import your own music - search folder? [MIUI8]

[canedha]

Hi,
with the latest release 6.0.0.864 when i try to import my own mp3 files, spotify only searches for files in the internal folder, while files on the external sd card are not found. the offline files are correctly stored on the external card though.
the pathes are:
/sdcard/Music (internal 16GB storage, searched by import function)
/storage/external_sd/Music (external 128GB storage, not searched but used for offline storage)

how can i make spotify to search also the external sd card? maybe a link on the internal to the external folder? if yes, how? tried it with root explorer without success...

thx in advance,
canedha