I ended up copying and pasting from a previous app that was working fine. I cannot say I know what solved the problem, but at least it worked.

I'm not sure about libpd, the app was apparently 32, but I followed the steps found online to make the change and they don't see to do anything.

None. The app is compiled perfectly, it does everything it's supposed to do, but when I upload it to play store, I get this message and doesn't let me upload it.

Probably, @seb-harmonik.ar, I'm not entire sure how to change that. I added
ndk {
abiFilters "armeabi-v7a", "x86", "arm64-v8a", "x86_64"
}
and other variants I found of that I found online, I do see the libraries in the apk analyzer, but I still get the same message.

I'm getting this error message when uploading the app to google play store, do you think it's related to libpd?

Thanks, @bocanegra, I'll give that a try.

I'm sure there is something I'm doing wrong but this takes a whole second to refresh.

Sorry, @bocanegra, I meant [bp~]. I'll try what you suggest. Thanks.

No, @seb-harmonik.ar, I was using [tabwrite~] with the name of the array; but I assuming it will be the same thing. I know that with [pb~]s you can add a message and write the array index you want with no need for bangs (none triggered by the user at least), and I was wondering if that was somehow possible with the [rfft~] object.

Is there another way to pass the numbers from [rfft~] to an array without using [tabwrite~]? I find [tabwrite~] makes the spectrum unstable (maybe something to do with the relationship between the number of bangs and the sampling frequency ... or maybe something else.)