if split := strings.Split(string(b64), "x"); len(split) == 2 {
					t, err := strconv.ParseInt(split[1], 10, 64)
					if err == nil {
						modTime = time.Unix(0, t)
					}
				}
			}
			// Fallback for older uploads without time in the ID.
			if modTime.IsZero() {
				wait := deleteMultipartCleanupSleeper.Timer(ctx)

			hdrs = r.Header
		}

		opts, err := putOpts(ctx, bucket, object, versionID, hdrs, metadata)
		if err != nil {
			return err
		}

		opts.MTime = info.ModTime()
		if opts.MTime.Unix() <= 0 {
			opts.MTime = UTCNow()
		}
		opts.IndexCB = idxCb

		retentionMode, retentionDate, legalHold, s3err := checkPutObjectLockAllowed(ctx, r, bucket, object, getObjectInfo, retPerms, holdPerms)