Thansferring apps from phone memory to SD card

I want to download new Apps and transfer some Apps already in the phones memory to a SD card.

I have a BLU Energy X Plus 2 , When I connect to my lap tops USB port it will make a connection for charging only. If I put it on data transfer the connection is broken. The SD card has been formatted for phone storage but nothing can be transferred to the card and if I download a new App it defaults to the phones storage.

I really want to move some of the Apps stored on the phones memory to the SD card but something is giving me a fit and I don't know why it isn't working like many of the YouTube tutorials show.

The manual for the phone says the largest SD card it will take is a 64GB, no explanation why it can't use a 128GB, so that is what I have installed.

Anyway, if someone can get meon the right path I sure would appreciate it.