Add ability to upload source packages to Debian APT repo

I'm running NXRM OSS version 3.25.1-04.

I have a small APT repository to which I can upload binary packages (.deb files). I also want to be able to upload the corresponding source packages (.dsc files).

When I try, I see a small popup saying "Invalid header format:" and this exception pops up in the logs:

java.io.IOException: invalid header Format:
at org.sonatype.nexus.repository.apt.internal.org.apache.commons.compress.archivers.ar.ArArchiveInputStream.getNextArEntry(ArArchiveInputStream.java:112)
at org.sonatype.nexus.repository.apt.internal.org.apache.commons.compress.archivers.ar.ArArchiveInputStream.getNextEntry(ArArchiveInputStream.java:240)
at org.sonatype.nexus.repository.apt.internal.AptPackageParser.parsePackage(AptPackageParser.java:45)
{{ at org.sonatype.nexus.repository.apt.AptUploadHandler.handle(AptUploadHandler.java:72)}}

(I can post the entire stack trace if needed)

I don't sign the packages myself, because Nexus signs the .deb files when I upload them. (I'm assuming it would also sign the dsc files if I could upload them.)

Thanks in advance for any help...
-Steve