I think we're doing the same thing. Here's my flow:
I made a creative based on the size of my document:
I exported using the inlining, and created a document. I then created a zip file of the html file and resources folder
I dragged that into the upload area:
To test, I clicked 'Default.html' and it successfully loaded the images:
Here's my working file, zip file, and document which contains the enabler and clicktag in place:
Archive.zip (2.8 MB)
Are you able to share your .hype and uploaded .zip file so I can test? (You can send me a private message by clicking on my picture).