Can't save data on SD card even with other solutions

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Plan

Premium (family)

Country

 France

Device

Huawei P9

Operating System

Android 7.0 (build VNS-L31C530B382)

My Question or Issue

 Hi,

I just subscribed to spotify family. Using huawei P9 lite, i can only save on my sd car due to the low available space in my internal storage. And that's one of the reasons i bought this app : to play music, with my music, offline. I tried many things tells here, and the "stockage" option appears nowhere in the settings. I also tried the "Android/data/com.spotify.music" in many ways. Nothing change and that's make me pretty much angry ahah. I hope someone will find a solution, or else i would pretty much stop spotify for another music app. Thank you in advance.

(PS : on huawei, there's only external storage available, so is mine)