Manual:Parameters to Special:Upload/gu
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The parameters to Special:Upload are:
wpSourceType
wpUpload
wpUploadIgnoreWarning
wpDestFile
wpUploadFile
wpLicense
wpDestFileWarningAck
wpIgnoreWarning
wpWatchthis
wpUploadCopyStatus
wpUploadSource
wpForReUpload
wpUploadDescription
wpCancelUpload
wpReUpload
andwpEditToken