Editing background page

Hi Liza. All uploaded images and PDFs are saved in our account unless we delete them. Initially, I didn't see the usefulness of this feature, since I've never used the same background for different worksheets. However, I must admit that creative teachers might use the same background to create worksheets at different levels. In your case, it would have been better if you had deleted the incorrect PNG before uploading the corrected one.
...
I wonder why you mentioned the MP3 problem. It was reported at the beginning of the month, and as far as I know, it has been successfully resolved. I've recently created 10 new worksheets with MP3 files, and they work perfectly fine. However, I had to change all MP3 file names to ones without any spaces because after adding them to a workbook, they didn't work. Maybe you can try that as well?
... ...
A request for an open-ended question or a text field with a neutral answer has already been posted and is awaiting a solution.
... ... ...
Regarding "the owners aren't interested." You said you made a mistake and went through the process to correct it. How much time did it take for you? 5 minutes? 10 minutes? More? Have you ever tried programming? Looking for a solution on how to instruct a machine to do what you want it to do? Correcting a mistake in code? Can you imagine how huge and complicated the Liveworksheets system is? How many pages of code script it consists of? It's not just a tiny worksheet. 5 days, 10 days, and often more, might be needed to fix one thing… Please don't take my words personally, Liza. That's what most of us – impatient users – haven't ever thought about.