I was able to successfully complete this operation on my LG K8 LTE. I want to note that there are problems with the "500 xxx Unknown disk" errors and give a solution to avoid this. The solution is very simple. The right steps at ADB will be:
adb shell sm list-disks // HERE YOU GET YOUR DISK ID, SOMETHING LIKE "disk:179,64" - REMEMBER THOSE NUMBERS sm set-force-adoptable true // IN NEXT LINE, SIMPLY PUT THOSE NUMBERS AFTER "disk:" AND ALSO AFTER WORD "mixed" TYPE PERCENTAGE OF SPACE LEFT AS EXTERNAL, SO IN MY CASE: sm partition disk:179,64 mixed 60 // IT TAKES TIME. BE PATIENT. WITH THIS LINE I TRANSFORMED WHOLE EXTERNAL SD INTO 40% OF INTERNAL AND 60% OF EXTERNAL sm set-force-adoptable false
BANG! It! Now go to the storage and usb, click on the inside of the SD and expand the parameters, click "use as internal" or something like that, the last parameter (I don’t see what it was because I already clicked on it and that's it works) applications finally go to SD with OBB files!;)
Have a nice day!
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