if err != nil {
				batchLogIf(ctx, err)
				continue
			}
			// TODO: I am not sure we read it back, but we aren't sending whether checksums are single/multipart.
			for k, vals := range opts.Header() {
				for _, v := range vals {
					snowballObj.Headers.Add(k, v)
				}
			}

			input <- snowballObj
		}
	}()

	// Collect and upload all entries.