Contao has a list of allowed file types, zip is in there by default. The list may be case sensitive though? So check if it works when you change the extension to .zip instead of .ZIP.
If you want to allow .ZIP, then the setting is in System -> Settings -> Upload file types.
You may also want to change the .htaccess so it allows for case insensitive file extension .zip. I'm not sure if that is not the default in Contao 2.11.x already. But it should look similar to:
Code:
<FilesMatch "\.(?i:htm|php|js|css|htc|png|gif|jpe?g|ico|xml|csv|txt|swf|flv|eot|woff|svg|ttf|pdf|gz|zip)$">
All in one line
I've added zip in the example. The "?i:" part makes the statement case insensitive.
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