This is not really a Hype Forum issue, But we may be able to point you in the right direction.
We would need more info though.
What are you actually trying to share.
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html export from Hype
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Hype Project file
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What size is the project file or export when zipped
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Is you colleague on the same network as you and have access to the same areas.
*Why are you allowed to use GitHub which requires you to upload the files and not dropbox ?
Speaking of Github, have a look at this.
and or
http://www.darrenscorner.com/wp-content/uploads/2016/12/Publish-Hype-with-Github.pdf