How to create an allure report in multi module project - jenkins

Question

I am able to create allure report for my automation tests at individual module level and works fine locally but that doesn't seem to work on Jenkins where all modules are run as part of pipeline and i guess jenkins is unable to find an aggregated allure report at project directory level. Is there a way to handle/solve this? Any suggestions appreciated.
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On Jenkins an empty report is attached and log reads -
$ /opt/fsroot/tools/ru.yandex.qatools.allure.jenkins.tools.AllureCommandlineInstallation/2.13.1/bin/allure generate -c -o /opt/fsroot/workspace/Flow/~/--tests/allure-report
allure-results does not exists
Report successfully generated to /opt/fsroot/workspace/Flow/~/--tests/allure-report
Allure report was successfully generated.

Answer 1

prerequisite : allure plugin is installed in Jenkins
After test stage use below in post stage
post {
always {
allure includeProperties: false, jdk: '', results: [[path: 'target/allure-results']]
}
}

Answer 2

You can always manually copy results from your modules to the project's root if the core plugin functionality doesn't work for you for some reason. Here's a Gradle example. But you can do the same for the Maven project as well.
tasks.register<Copy>("copyApiResults") {
from("${projectDir}/api/build/allure-results")
into("${buildDir}/allure-results")
}
tasks.register<Copy>("copyUiResults") {
from("${projectDir}/ui/build/allure-results")
into("${buildDir}/allure-results")
}