Hello
When I use the web interface I come across a bug:
1. Open a image in the preview mode.
2. Rename the image.
3. Click on "Download"
4. A empty file with the old filename is downloaded.
The only solution I know is to:
1. Go back one step to the folder.
2. Reload that page so the new filename is loaded.
3. Click on the image again to open it in the preview mode.
4. Click on the "Download" button.
(Refreshing the page after the name change result in a 404-page because the old filename is still in the URL.)