If you want to include whole modules, use modulesSets, but if you want to choose which files to add, you can use fileSets in the build configuration file from a top-level project, for example:
<fileSets>
<fileSet>
<directory>${basedir}/myModule/src/main/resources</directory>
<includes>
<include>*.txt</include>
</includes>
</fileSet>
</fileSets>
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