Google play does actually allow you to upload up to I think 50000 songs to your account if you have a play music subscription, which you got 12 months for free with the home max. I'm not sure how you do this but if you look on-line it shouldn't be too hard to figure out. In any case if there are missing tracks which you bought elsewhere, you should be able to fill the gaps in Google's catalog easily enough.
Needing 2 identical speakers for stereo pairing isn't really too unusual, it makes sense from a physics point of view. If you'd have a large and a smaller speaker playing the left and right channels of a song that makes a lot of use from stereo separation, it would sound completely wrong with one side overpowering the other. Every company that lets you make a stereo pair from 2 wireless speakers (Google, Amazon, Sonos, JBL, Bose) all only let you do it with 2 identical speakers. That being said, as far as I know every Google home is stereo. Because the left and right speakers are in one unit you probably have to be sitting in front of it at a very particular point to even notice it, and the stereo image won't be as wide as having 2 separate units. But you should still notice a bit of stereo separation. Try playing something like Money by Pink Floid which makes for a good test.
The audio jack on the Home max is Line-in. It's the only Google home that has one. It allows you to connect older analog sources to it, like your computer or TV for example. All the other stuff like Stereo Pairing is probably all done wirelessly
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