Manual files
Everything we have seen so far only supports projects hosted on Modrinth. However, you might want to add other projects that are hosted on GitHub, or even CurseForge. To do this, you can add the manual_files key to the branch configuration (branch.json). You have to put a list of files. To see what information you need to provide, look at the configuration reference.
You can add any manual files and export it to a Modrinth modpack, but to host a Modrinth modpack on the Modrinth website, the download links can only be from these websites:
cdn.modrinth.comgithub.comraw.githubusercontent.comgitlab.com