mathi8vadhanan
1000+ Head-Fier
You can use the Meenova. It works very well. That can give you a potential 256gb of memory.
Some manufactures have gone from one memory slot to 2 and some from 2 to 1. We will continue to work on the best options.
With the meenova and SD to Micro SD extender, you can go 512GB + 128 GB (micro sd) = 640GB of portable goodness.