Hi Kamiko, Thanks for contacting us and so sorry to hear that you’re experiencing these issues! Unfortunately the Basic Downloader requires the image(s) to be uploaded to our server because it performs the edits on our server and then downloads the resulting edited image.
A suggestions to work around the problems you’re having: Try uploading multiple images at once. That way you can see the progress of the uploads before you start editing them, and can then be sure they’ve completed successfully before you edit. This will also allow you to get multiple uploads over and done with so you don’t have to worry if they’ve succeeded or not.
You could also try resolving the crashing you’re experiencing by experimenting with installing different (older) versions of Flash for Linux.
Let us know if we can be of any further assistance!