diff --git a/renter/renter.go b/renter/renter.go
index 766a55b..b87f48d 100644
--- a/renter/renter.go
+++ b/renter/renter.go
@@ -3,11 +3,9 @@ package renter
 import (
 	"context"
 	"errors"
-	"fmt"
 	"io"
 	"math"
 	"net/url"
-	"strconv"
 	"strings"
 
 	"git.lumeweb.com/LumeWeb/portal/db/models"
@@ -17,7 +15,6 @@ import (
 	"git.lumeweb.com/LumeWeb/portal/config"
 
 	"git.lumeweb.com/LumeWeb/portal/cron"
-	"github.com/google/uuid"
 	rhpv2 "go.sia.tech/core/rhp/v2"
 	"go.sia.tech/renterd/api"
 	busClient "go.sia.tech/renterd/bus/client"
@@ -179,7 +176,18 @@ func (r *RenterDefault) UploadObjectMultipart(ctx context.Context, params *Multi
 		uploadId = siaUpload.UploadID
 	}
 
-	if len(uploadId) > 0 {
+	if len(uploadId) == 0 {
+		upload, err := r.busClient.CreateMultipartUpload(ctx, bucket, fileName, api.CreateMultipartOptions{Key: object.NoOpKey})
+		if err != nil {
+			return err
+		}
+
+		uploadId = upload.UploadID
+		siaUpload.UploadID = uploadId
+		if tx := r.db.WithContext(ctx).Model(&siaUpload).Save(&siaUpload); tx.Error != nil {
+			return tx.Error
+		}
+	} else {
 		// TODO: Switch to using https://github.com/SiaFoundation/renterd/pull/974 after renterd is moved to core/coreutils. We cannot update until then due to WIP work.
 		existing, err := r.busClient.MultipartUploadParts(ctx, bucket, fileName, uploadId, 0, 0)
 
@@ -201,89 +209,37 @@ func (r *RenterDefault) UploadObjectMultipart(ctx context.Context, params *Multi
 				start = uint64(len(uploadParts)) - 1
 			}
 		}
-
-	}
-
-	if uploadId == "" {
-		upload, err := r.busClient.CreateMultipartUpload(ctx, bucket, fileName, api.CreateMultipartOptions{Key: object.NoOpKey})
-		if err != nil {
-			return err
-		}
-
-		uploadId = upload.UploadID
-		siaUpload.UploadID = uploadId
-		if tx := r.db.WithContext(ctx).Model(&siaUpload).Save(&siaUpload); tx.Error != nil {
-			return tx.Error
-		}
 	}
 
 	if idHandler != nil {
 		idHandler(uploadId)
 	}
 
-	for i := start; i < parts; i++ {
-		start := i * slabSize
+	reader, err := rf(uint(start*slabSize), uint(0))
+	if err != nil {
+		return err
+	}
 
-		end := start + slabSize
-		if end > size {
-			end = size
+	defer func(reader io.ReadCloser) {
+		err := reader.Close()
+		if err != nil {
+			r.logger.Error("error closing reader", zap.Error(err))
 		}
-		nextChan := make(chan string, 0)
-		errChan := make(chan error, 0)
+	}(reader)
 
+	for i := start; i < parts; i++ {
+		lr := io.LimitReader(reader, int64(slabSize))
 		partNumber := int(i + 1)
 
-		job := r.cron.RetryableJob(cron.RetryableJobParams{
-			Name: fileName + "-part-" + strconv.FormatUint(i, 10),
-			Function: func() error {
-				reader, err := rf(uint(start), uint(end))
-				defer func(reader io.ReadCloser) {
-					err := reader.Close()
-					if err != nil {
-						r.logger.Error("failed to close reader", zap.Error(err))
-					}
-				}(reader)
-
-				if err != nil {
-					return err
-				}
-
-				ret, err := r.workerClient.UploadMultipartUploadPart(context.Background(), reader, bucket, fileName, uploadId, partNumber, api.UploadMultipartUploadPartOptions{})
-				if err != nil {
-					return err
-				}
-
-				nextChan <- ret.ETag
-				return nil
-			},
-			Limit: 10,
-			Error: func(jobID uuid.UUID, jobName string, err error) {
-				if errors.Is(err, cron.ErrRetryLimitReached) {
-					r.logger.Error("failed to upload part", zap.String("jobName", jobName), zap.Error(err))
-					errChan <- err
-				}
-			},
-		})
-
-		_, err = r.cron.CreateJob(job)
+		ret, err := r.workerClient.UploadMultipartUploadPart(ctx, lr, bucket, fileName, uploadId, partNumber, api.UploadMultipartUploadPartOptions{})
 		if err != nil {
-			r.logger.Error("failed to create job", zap.Error(err))
 			return err
 		}
 
 		uploadParts[i] = api.MultipartCompletedPart{
 			PartNumber: partNumber,
+			ETag:       ret.ETag,
 		}
-
-		select {
-		case err = <-errChan:
-			return fmt.Errorf("failed to upload part %d: %s", i, err.Error())
-		case etag := <-nextChan:
-			uploadParts[i].ETag = etag
-		case <-ctx.Done():
-			return ctx.Err()
-		}
-
 	}
 
 	_, err = r.busClient.CompleteMultipartUpload(ctx, bucket, fileName, uploadId, uploadParts)