Once you have created a new project, you will be redirected to RapidUI's studio.
In order to upload your Photoshop/Sketch design, simply drag and drop your file inside the studio, or “click to browse” and select your file.
As soon as you upload your file, RapidUI starts building your site.
Make sure to leave the tab open (the upload will slow down drastically if you switch to a different tab) - and sit back and enjoy the ride!
It is recommended to upload a separate design file for mobile resolutions. All you need to do is to head to the mobile breakpoint. You will then be asked if you would like to upload a separate design file for mobile (you can find the full guide here).