When I install Spotify or I clear Spotify's storage, and I login for the first time, it recognized the extend storage perfectly, showing I have about 160 GB in total. In fact, I can start downloading most of my playlists with no issues.
The problem is that when I reboot the phone, for some strange reason Spotify doesn't recognize the extended storage, only the main storage (only 32 GB). So if I had previously downloaded my playlists, it starts from scratch and there isn't enough space to finish this in the main storage.
The weird thing is that I have tried with Spotify Lite, and this issues does not occur. However, I do not like Spotify Lite, it is just too simple.
I have also configured my SD Card as portable storage and the issues disappears, however, I do prefer my SD setup as extended storage.