When I try to upload pictures for the product category I receive these messages.
"Error: Destination not writeable."
"Error: Catalog images directory is not writeable:
Admin
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Yes, it will since those images are in catalog/includes/languages/english/images/icon.gif which does not have writing rights (security risk). One would typically ftp it there, which we do not allow anymore. So keep it as is - I have taken note of what you tried to do.