Everything you have said so far are KNOWN issues that have Been discussed at length on the forums.
The storage options facility is a known bug. The selections are there, just no visible. Also, when you set your phone up first time, you should be asked where to put apps, if you have sd card.
With here drive + you known get the option to save maps to SD card for offline use.
From my experience of W10M, storage is operating as it should, it's just not shown in storage sense.
As mentioned above, if you go to my library in store and find here drive, you CAN download it that way. That's how pretty much all of us have done it.
If you aren't sure, search the boards and you will see lots of posts about this.