Not a lot. In Bintray, the upload process is simple and straightforward. A few points to note, however, are as follows:
Licensing: Every package uploaded to Bintray must include a reference to the license under which it may be used, modified and redistributed by the users.
Import Options: If your material is already published in GitHub, you can easily and systematically import it from GitHub to Bintray without the need to re-upload it.
Advanced Support: Although Bintray supports the uploading of any type of software, some types of software (Maven, RPM and Debian) enjoy advanced support. Among other options, these can include the automatic calculation and indexing of metadata, and in some cases, the option of being included in a central repository.