Thanks for looking into this!
Something I’ve discovered: If I’m not logged in and I upload a copy of something that already exists, it will work!
For example, I can go to app.netlify.com/drop, download the demo site that’s linked there and reupload it - that will work, because an exact copy of that was already deployed before by someone else who was logged in (I guess maybe contents are associated to deployments by a hash??). However, if I just change a single character from something that is already deployed it won’t upload successfully.
Also, this has been occuring for me since a couple of months I think.
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