Thanks - that was a huge help. I was thinking it all would be done via Storage, but I see it's done by apps. Some of the wording is different, but it got me in the right direction. I guess I have to not think like I'm using a PC. It was easy enough to specify the SD card as the destination for future photos and videos, verified that's where they're going. So far moved all photos and music to the SD card. It was enough so I no longer get the warning about low storage space, Later I'll connect it to the PC to synch playlist from Media Player, hopefully I'll see the SD card as a destination like I did with the tablet.
Unless I totally missed them, there's no instructions in the manual for this process. I have the .pdf version and searched on 'Move'. I should have done this a while ago, the SD card was about $14 + tax. But I'm not a 'normal' person, meaning I don't use my phone much, home phone is analog tip and ring via Ooma. Not much data on my phone, photos stored on the PC and Google Drive, music streamed and played by the PC.