David -- Thanks for the clarification. I thought I must be missing something. For the time being, I'll use the "upload then delete" strategy. All I'm trying to do is make lots of edits to fixture definitions I'm testing before releasing them to the wild.

I'm new to the GDTF builder. I would like to experiment with creating and/or modifying existing fixtures and download my work in progress to test on my console. It appears that there's no way to do this -- you seem to be required to upload any changes made to GDTF-Share before you can download the resulting .gdtf file. Or am I missing something? I would prefer to be able to use the editor, download a draft version of the GDTF, test it, and make additional changes before uploading/sharing the final version. Is there any way to do this?