diff --git a/drivers/s3/driver.go b/drivers/s3/driver.go
index a037912f6a..46d7f414a3 100644
--- a/drivers/s3/driver.go
+++ b/drivers/s3/driver.go
@@ -193,7 +193,7 @@ func (d *S3) Remove(ctx context.Context, obj model.Obj) error {
 	if obj.IsDir() {
 		return d.removeDir(ctx, obj.GetPath())
 	}
-	return d.removeFile(obj.GetPath())
+	return d.removeFile(ctx, obj.GetPath())
 }
 
 func (d *S3) Put(ctx context.Context, dstDir model.Obj, s model.FileStreamer, up driver.UpdateProgress) error {
@@ -249,7 +249,15 @@ func (d *S3) GetDirectUploadInfo(ctx context.Context, _ string, dstDir model.Obj
 // implements driver.Getter interface
 func (d *S3) Get(ctx context.Context, path string) (model.Obj, error) {
 	// try to get object as a file using HeadObject
-	path = stdpath.Join(d.GetRootPath(), path)
+	rootPath := d.GetRootPath()
+	// Avoid double-prepending root path when path already contains it.
+	// This happens when obj.GetPath() from a previous Get call is passed back
+	// to op.List → op.Get → d.Get.
+	if rootPath != "/" && utils.IsSubPath(rootPath, path) {
+		// path already includes the root prefix
+	} else {
+		path = stdpath.Join(rootPath, path)
+	}
 	key := getKey(path, false)
 	headInput := &s3.HeadObjectInput{
 		Bucket: &d.Bucket,
diff --git a/drivers/s3/meta.go b/drivers/s3/meta.go
index b2439c683a..4243f12d56 100644
--- a/drivers/s3/meta.go
+++ b/drivers/s3/meta.go
@@ -23,6 +23,7 @@ type Addition struct {
 	AddFilenameToDisposition bool   `json:"add_filename_to_disposition" help:"Add filename to Content-Disposition header."`
 	EnableDirectUpload       bool   `json:"enable_direct_upload" default:"false"`
 	DirectUploadHost         string `json:"direct_upload_host" required:"false"`
+	UserAgent                string `json:"user_agent" required:"false" default:"" help:"Custom User-Agent for S3 requests."`
 }
 
 func init() {
diff --git a/drivers/s3/util.go b/drivers/s3/util.go
index c84380786a..8500ed2645 100644
--- a/drivers/s3/util.go
+++ b/drivers/s3/util.go
@@ -49,6 +49,11 @@ const (
 
 func (d *S3) getClient(clientType int) *s3.S3 {
 	client := s3.New(d.Session)
+	if d.UserAgent != "" {
+		client.Handlers.Build.PushBack(func(r *request.Request) {
+			r.HTTPRequest.Header.Set("User-Agent", d.UserAgent)
+		})
+	}
 	if clientType == ClientTypeLink && d.CustomHost != "" {
 		client.Handlers.Build.PushBack(func(r *request.Request) {
 			if r.HTTPRequest.Method != http.MethodGet {
@@ -223,7 +228,7 @@ func (d *S3) copyFile(ctx context.Context, src string, dst string) error {
 		CopySource: aws.String(encodedKey),
 		Key:        &dstKey,
 	}
-	_, err := d.client.CopyObject(input)
+	_, err := d.client.CopyObjectWithContext(ctx, input)
 	return err
 }
 
@@ -257,23 +262,23 @@ func (d *S3) removeDir(ctx context.Context, src string) error {
 		if obj.IsDir() {
 			err = d.removeDir(ctx, cSrc)
 		} else {
-			err = d.removeFile(cSrc)
+			err = d.removeFile(ctx, cSrc)
 		}
 		if err != nil {
 			return err
 		}
 	}
-	_ = d.removeFile(path.Join(src, getPlaceholderName(d.Placeholder)))
-	_ = d.removeFile(path.Join(src, d.Placeholder))
+	_ = d.removeFile(ctx, path.Join(src, getPlaceholderName(d.Placeholder)))
+	_ = d.removeFile(ctx, path.Join(src, d.Placeholder))
 	return nil
 }
 
-func (d *S3) removeFile(src string) error {
+func (d *S3) removeFile(ctx context.Context, src string) error {
 	key := getKey(src, false)
 	input := &s3.DeleteObjectInput{
 		Bucket: &d.Bucket,
 		Key:    &key,
 	}
-	_, err := d.client.DeleteObject(input)
+	_, err := d.client.DeleteObjectWithContext(ctx, input)
 	return err
 }