I am running into an issue when attempting to upload a CSS file into the design manager. Using Chrome, Admin: Design, created a new folder under themes. I can get as far as selecting my file from my browser, but the save button seems not to be responding. Thanks.
Thanks for identifying this. You should be able to upload files to Design in Finder through either Dashboard, Editor, or Design modes of CM1. After testing this out in both Chrome and FireFox, I can confirm it works fine from the Dashboard and Editor modes. When in Design, through the CM1 Menu, it appears you cannot upload to Design in Finder.
This issue does not appear to be browser specific. Because of this, I have logged this in our system to be resolved and I am changing this to a Problem and setting the status for you.
As a workaround, for now, you can still upload files to your theme folders using the Dashboard or Editor mode in CM1.
I have also included a link for the Design in Finder and Themes functionality of CM1: