@yellowelise Please follow my instructions about what you need to post to get help.
Also, see what statements are and are not necessary.

@kevindtimm There is such a thing, all of the sketches appear to be on the M5Paper github pages

@yellowelise you can skip the SPI.begin(), it's not necessary.
SD.begin(4); is all that's necessary for that call.
There are issues with SD cards bigger than 16GB in some cases.

BTW, when you report these issues it would be much better if you would report what errors you get as well as how far the program got (show the output)

@veryalien I saw all that information on the back but, when I couldn't get the card to read, I wasn't sure how much of it I could believe. Now that the card works I see how to use that info.

In the test application there is a 'Home Automation' section, it just has some pretty buttons. Is there an arduino sketch somewhere that shows how the m5paper could interface to alexa? Or some of my other smart devices?

@mati I bought 5 16gb cards, tested them yesterday, they work fine. But, I have 32gb that work in all my pc's and my phone but don't work in my m5paper. I did have to use as CS of 4 in the SD.begin() call, this is not documented in the SD_Test example.

@veryalien I received my 16gb cards yesterday and they worked :)
It's rather odd that I have to restart the test app after each insertion/removal to get it to work but they do work.
Note too that you have to use the CS value (of 4) for SD.begin() to work, too bad this isn't documented in the examples (see SD_Test.ino in arduino IDE)

Things are better now, but I can say that 16gb is a ridiculously low value for storage on a 2020 device :(

Now I have to figure out how to implement the home automation bit -> it sure would be nice to connect to my alexa skills and go from there.

@lukasmaximus I'm using the SD_test example, just trying 'SD.begin()' fails. It seems I might have to give it the CS values, but that value doesn't seem to make any difference either (I'm using 4, as that is the value on the back of the M5Paper)

@lukasmaximus Patriot Brand micro SD card. I didn't know there were 'necessary' files, I just moved some generic files into the root directory.

@veryalien I have an amazon order of 5 new 16gb cards coming tomorrow. Crossing my fingers.