diff --git a/backend/teldrive/teldrive.go b/backend/teldrive/teldrive.go
index be5adfea4209c..db39e0d56663f 100644
--- a/backend/teldrive/teldrive.go
+++ b/backend/teldrive/teldrive.go
@@ -855,15 +855,16 @@ func (o *Object) Open(ctx context.Context, options ...fs.OpenOption) (in io.Read
 
 	fs.FixRangeOption(options, o.size)
 
-	streamType := "download"
-	if o.fs.opt.ThreadedStreams {
-		streamType = "stream"
-	}
 	opts := rest.Opts{
 		Method:  "GET",
-		Path:    fmt.Sprintf("/api/files/%s/%s/%s", o.id, streamType, url.QueryEscape(o.name)),
+		Path:    fmt.Sprintf("/api/files/%s/%s", o.id, url.QueryEscape(o.name)),
 		Options: options,
 	}
+	if !o.fs.opt.ThreadedStreams {
+		opts.Parameters = url.Values{
+			"download": []string{"1"},
+		}
+	}
 
 	err = o.fs.pacer.Call(func() (bool, error) {
 		resp, err = http.Call(ctx, &opts)
diff --git a/backend/teldrive/upload.go b/backend/teldrive/upload.go
index 93b47ea785d7f..9292616633437 100644
--- a/backend/teldrive/upload.go
+++ b/backend/teldrive/upload.go
@@ -105,6 +105,7 @@ func (w *objectChunkWriter) WriteChunk(ctx context.Context, chunkNumber int, rea
 			Method:        "POST",
 			Body:          reader,
 			ContentLength: &size,
+			ContentType:   "application/octet-stream",
 			Parameters: url.Values{
 				"partName":  []string{partName},
 				"fileName":  []string{fileName},
@@ -291,6 +292,7 @@ func (o *Object) uploadMultipart(ctx context.Context, in io.Reader, src fs.Objec
 				Method:        "POST",
 				Body:          partReader,
 				ContentLength: &n,
+				ContentType:   "application/octet-stream",
 				Parameters: url.Values{
 					"partName":  []string{chunkName},
 					"fileName":  []string{uploadInfo.fileName},