adb shell
sm set-force-adoptable true
sm partition disk:179,64 private (or mixed 50 instead of private for 1/2 & 1/2)
sm set-force-adoptable false
sm list-volumes all
Just make sure to let the phone format the sdcard first before running the commands or it will do so & restart your phone.
Also if you go up under storage and see a "greyed out" usb card listing, just click on it and it will give you the option to "forget" it.
When you go back up under storage after these commands, especially if you do 50/50 or another percentage, that will show you it worked. If you do the entire card it will still show your internal as 16gb, and the size of your ext_sdcard, but when you click the 3 dot menu, the drop down will give an option to format as portable storage again if it worked.
You will not be able to move the pre-installed apps to sd card but this will give you room for alot more than what you had!
I'm stuck right now, caught the update.zip, downloaded it and its a full kdz for my BOOST Stylo 2 with 6.0.1, and I got a script for Terminal that will replace Kingroot's temp root with SuperSU but until I get LGUP recognizing my phone so I can flash in case of a problem, not taking a step further.
Posted all over XDA, no responses yet, but it is Sunday..............
oh well