Manual:$wgCopyUploadAllowOnWikiDomainConfig

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Files and file uploads: $wgCopyUploadAllowOnWikiDomainConfig
If true, the value of $wgCopyUploadsDomains will be merged with the contents of MediaWiki:Copyupload-allowed-domains.
Introduced in version:1.39.0 (Gerrit change 758100; git #caa8a2c3)
Removed in version:still in use
Allowed values:Unspecified
Default value:false