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

Details

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