It took me a little troubleshooting to figure out what was causing the uploader to hang at "Uploading" was due to missing file extensions
When saving for web in Photoshop it is easy to sometimes overwrite the file extension and this issue can be compounded if you've elected to hide file extensions in OSX - Coupled with the fact the OSX can open images just fine without a file extension (So its difficult to notice what the issue is).
It would be great if Webflow would at least give a "FIle not supported" message in the uploader if a file is not recognized instead of being stuck perpetually on upload.
I just thought I would point that out incase anyone ran into uploader issues. A big thanks to the Webflow team for all the great updates!