Manual:$wgEnableAsyncUploadsByURL

Files and file uploads: $wgEnableAsyncUploadsByURL
Enable the async processing of upload by url in Special:Upload.
Introduced in version:1.42.0 (Gerrit change 1007344; git #cfa7ed13)
Removed in version:still in use
Allowed values:Unspecified
Default value:false

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Enable the async processing of upload by url in Special:Upload. Only works if $wgEnableAsyncUploads is also enabled.