Firebase crash is a cool tool but as fair as I know there is not any way to programmatically upload Proguard mapping file via API after a build.
Recently, "automate file uploads" options appairs but no info are actually aviable in the learn more link.
Does anyone know something more?
On 15th December the Crash Reporting plugin was released by google: it will generate a gradle task that performs the upload of ProGuard mappings file to Firebase Crash.
Here the steps to use it: https://firebase.google.com/docs/crash/android#uploading_proguard_mapping_files_with_gradle
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