Conan upload export

I am trying to upload a conan package with some external files. These extra files are uploaded in conan_export.tgz. Conan says that the conan_export.tgz is compressed, but never uploads. Gitlab remote is able to receive conan_package.tgz, conaninfo.txt, conanmanifest.txt, but not conan_export.tgz. Is gitlab not accepting these files?