The fact that the system did not respond for 15 minutes, it might have been a temporary issue with one of the Opensolr servers, that is probably sorted out by now, or that there was something wrong with the archive you were trying to upload.
Also the Finish Editing button will close the editor. There is a separate button for Save File that reads "Save File" that will save the file :)
You should also take a look at the Automation REST APIs and try to upload your config files that way.
Ultimately, please check that your archive only contains text files->XML, txt (no binary files, .jar plugins, etc), and also, that your files are not too large. Also make sure all files are under the root directory and that there are no subdirectories in the archive.
If everything else fails, please email your:
- Opensolr Index name
- Registration email address
- Config files zip archive
to firstname.lastname@example.org and we'll be happy to apply your config files for you.
Hope this helps.