diff --git a/src/io/import/processors/importSingleFile.ts b/src/io/import/processors/importSingleFile.ts
index 33c2864db..f64de81c9 100644
--- a/src/io/import/processors/importSingleFile.ts
+++ b/src/io/import/processors/importSingleFile.ts
@@ -6,6 +6,8 @@ import { useModelStore } from '@/src/store/datasets-models';
 import { FILE_READERS } from '@/src/io';
 import { ImportHandler } from '@/src/io/import/common';
 import { DataSourceWithFile } from '@/src/io/import/dataSource';
+import { useDatasetStore } from '@/src/store/datasets';
+import { useMessageStore } from '@/src/store/messages';
 
 /**
  * Reads and imports a file DataSource.
@@ -42,6 +44,11 @@ const importSingleFile: ImportHandler = async (dataSource, { done }) => {
   }
 
   if (dataObject.isA('vtkPolyData')) {
+    if (!useDatasetStore().primarySelection) {
+      useMessageStore().addWarning(
+        'Load an image to see the mesh. Initializing viewports from mesh files is not implemented.'
+      );
+    }
     const dataID = useModelStore().addVTKPolyData(
       fileSrc.file.name,
       dataObject as vtkPolyData
diff --git a/src/store/datasets-dicom.ts b/src/store/datasets-dicom.ts
index 45fbdf831..6a6d8b858 100644
--- a/src/store/datasets-dicom.ts
+++ b/src/store/datasets-dicom.ts
@@ -127,6 +127,8 @@ export const useDICOMStore = defineStore('dicom', {
       const allFiles = [...fileToDataSource.keys()];
 
       const volumeToFiles = await dicomIO.categorizeFiles(allFiles);
+      if (Object.keys(volumeToFiles).length === 0)
+        throw new Error('No volumes categorized from DICOM file(s)');
 
       const fileStore = useFileStore();