function checkInstantUpload() {
			if (this.bInstantUpload === false) {
				this.setProperty("instantUpload", this.bInstantUpload, true);
				delete this.bInstantUpload;
			}
		}
Opens the FileUploader dialog. When an UploadCollectionItem is provided, this method can be used to update a file with a new version.
In this case, the upload progress can be sequenced using the events: beforeUploadStarts, uploadComplete and uploadTerminated. For this use,
multiple properties from the UploadCollection have to be set to false. If no UploadCollectionItem is provided, only the dialog opens
and no further configuration of the UploadCollection is needed.
@param {sap.m.UploadCollectionItem} item The item to update with a new version. This parameter is mandatory.
@returns {this} this to allow method chaining
@since 1.38.0
@public