SANDISK - Ultra 32GB USB 3.0, Micro USB Flash Drive - Gray / Transparent

You will most likely have to remove the phone from its case to use. I have a ruggedized case on my Note 9, and the port looked large enough, but was hindered from properly plugging it in. It may sound like a hassle, but worth the result.

Yes, you can transfer either way, from your cell phone to your memory card through the computer, please keep in mind your computer should be capable to read memory cards and also have USB port

Yes, This product is backward capable

Yes. Product is Designed Android platforms.

I have a Samsung Note 3, which came out in 2013 and this product works for me. I put movies, pictures, videos and music on these USB's and the only issue I've had is some tv's, car stereo systems and laptops don't recognize the format that the info is formatted in. The older versions of this product, which are still available, seem to be more compatible with these systems.