I am clueless. How do I send photos from my phone (LG Aristo) to my fire HD10. Thanks!
There are a number of ways to do this. While the e-mail method would work for a few pictures, it would be rather cumbersome if you have many. For that, the easiest way for a less technically savvy person would probably be to use the same file sync app on both devices.
Amazon Photos will already be on your HD 10, and to install it on your Aristo, you can get it from the Google Play store:
Set the app to auto back up your photos, and they will begin to sink to the cloud, where you can access them on your HD 10.
Even if you don't have a Prime account, you'll get 5 GB of free storage, which I expect would be enough for your photos (and Prime account holders get unlimited photo storage). If you don't want to use it after the file transfer, you can just delete it from your Aristo afterward.
As I said, there are a number of ways, so if for some reason that won't work for you, just let me know.