Found no option for using sd card as internal storage

[AC Question]

I am using glaxay grand prime plus and using my sd card as portable storage but now I want to use sd card as internal storage. Now the problem is that I am unable to found any option to format sd card as internal storage. The only option I found is to format it as portable storage.
I tried it many times but all in vain.
Suggest me what should I do.

 

[Tim1954]

Could be that your device is not capable of doing that...