Sounds like your use case should work and you should be able to upload your files <https://cloud.google.com/storage/docs/uploading-objects>. You can use Cloud Storage on Firebase <https://firebase.google.com/docs/storage/> without significant change to your use case it seems. I don't believe either option would provide better security, either seems like it should work. This issue looks like it may require exchange of sensitive information like your project ID for more visibility so if you are still experiencing the issue please create an issue tracker <https://issuetracker.google.com> and refer to this groups issue.
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