I noticed that we have apk-files on the 'mappings' tab in the AppCenter web-console. The 'pathToApp' and 'pathToDebugSymbols' params in my jenkins-file are correct. I browse the source code of the plugin and found that the 'pathToDebugSymbols' param is used for determine a symbol type only and nothing else. It leads to the situation when an APK-file is uploaded instead of file with debug symbols.