Nothing can be saved or changed on the !demo channel, but you can on your own channel.

Share your creations with !demo

Uploading is permitted for:

Whenever a file gets uploaded, the bot will announce this in chat:
Example:

Your files

Please note: Files are removed periodically; this is not a portfolio.

Upload new file:
Or drop files here to upload

Delete file

Really delete this file?

...

This file will be deleted after a day anyway, but if you wish to remove
it sooner, deleting it will immediately make it unavailable.