deofuscation files and debug symbol

Good Morning. I have uploaded my apk to google play console and it gives me these warnings:

1) There is no deofuscation file associated with this APK. If you are using obfuscated code (R8 / ProGuard), you can upload a deofuscation file to make it easier to analyze and debug ANR bugs and errors. Using R8 / ProGuard can help reduce the size of the application

2) This APK contains native code, but you have not uploaded debugging symbols. We recommend that you upload a symbol file to facilitate the analysis and debugging of ANR errors and failures.

My question is where to get deofuscation file and debug symbol file.

Another question I have is this: my app is not available for devices with an ABI: armeabi-v7a. My ABI is: arm64-v8a
If I don't put that ABI google play console it gives me an error !!

They are a lot of devices !! Is there any way to fix it?

Thanks a lot.