How to actually merge/join the internal storage and external SD card! I have a 30 Gig external SD card in my LG 9 phone. I am trying to merge/join the SD card with the internal storage so when i save ANYTHING on my phone whether it be an app (including updates), a song, a video, a picture, system updates, etc. I want it all to know how to save to my SD card automatically without setting up directories or using a "transfer file to SD card" app.
You can try link2sd, use the first partition on SD as internal storage.

I had many issues with link2sd, mostly related to app failing installation/upgrade