As of now, Studio Keys only reliably handles conversion of .studio files smaller than ~38 MB. If you upload a file larger than that, there is a possibility that the program will time out and you'll see a "502: Bad Gateway" page. This has to do with some memory usage bugs in the deployment environment which I am resolving. However, I can manually convert larger .studio files and will do so for a small fee. If you would like a larger file converted, please fill out this form.
Please note that the conversion program is not perfect. There may be inaccuracies in your converted SVG mockups. The program is still being worked on, and updates will be released. Please see the "Known Issues and Limitations" section of the Read Me for more information.