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This option should contain a comma separated list of options you can override. These options can then be changed specifically in various directories by adding them to a mc_access file. The default value of this option is "*" which tells MCImageManager to allow override of all options.
$mcImageManagerConfig['upload.allow_override'] = "maxsize";
<add key="upload.allow_override" value="maxsize" />
# Override something
upload.maxsize=10MB
# Allow override
upload.allow_override=maxsize
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