Show error if the upload failed

Contributes to issue CURA-8609.

cura/Machines/Models/MaterialManagementModel.py

@@ -405,6 +405,8 @@ class MaterialManagementModel(QObject):
         job.uploadCompleted.connect(self.exportUploadCompleted)
         job.start()
 
-    def exportUploadCompleted(self):
+    def exportUploadCompleted(self, job_result: UploadMaterialsJob.Result):
+        if job_result == UploadMaterialsJob.Result.FAILED:
+            self._sync_all_dialog.setProperty("syncStatusText", catalog.i18nc("@text", "Something went wrong when sending the materials to the printers."))
         self._export_upload_status = "idle"
         self.exportUploadStatusChanged.emit()

cura/PrinterOutput/UploadMaterialsJob.py

@@ -79,9 +79,11 @@ class UploadMaterialsJob(Job):
         if error is not None:
             Logger.error(f"Failed to upload material archive: {error}")
             self.setResult(self.Result.FAILED)
-            return
+        else:
             self.setResult(self.Result.SUCCESS)
-        self.uploadCompleted.emit()
+        self.uploadCompleted.emit(self.getResult())
 
     def onError(self, reply: "QNetworkReply", error: Optional["QNetworkReply.NetworkError"]):
-        pass  # TODO: Handle errors.
+        Logger.error(f"Failed to upload material archive: {error}")
+        self.setResult(self.Result.FAILED)
+        self.uploadCompleted.emit(self.getResult())

resources/qml/Preferences/Materials/MaterialsSyncDialog.qml

@@ -23,6 +23,7 @@ Window
 
     property variant materialManagementModel
     property alias pageIndex: swipeView.currentIndex
+    property alias syncStatusText: syncStatusLabel.text
 
     SwipeView
     {
@@ -358,6 +359,19 @@ Window
                             return materialManagementModel.exportUploadStatus != "uploading";
                         }
                     }
+                    Label
+                    {
+                        id: syncStatusLabel
+
+                        anchors.right: syncButton.left
+                        anchors.rightMargin: UM.Theme.getSize("default_margin").width
+                        anchors.verticalCenter: parent.verticalCenter
+
+                        visible: syncButton.visible
+                        text: ""
+                        color: UM.Theme.getColor("text")
+                        font: UM.Theme.getFont("default")
+                    }
                     Item
                     {
                         anchors.right: parent.right