I have built my android library package (aar) and the result of build is created in \"..\\app\\build\\outputs\\aar\" folder. The file within this folder is called \"app-deb
You can use command line
./gradlew :assemble
./gradlew :assemble
//for example
./gradlew :assembleRelease
//or
./gradlew :bundleAar
//for example
./gradlew :bundleReleaseAar
//output is located
/build/outputs/aar/-.aar
Alternatively you can use AndroidStudio UI
View -> Tool Windows -> Gradle
-> Tasks -> build or others -> assembleRelease