diff --git a/cvat-ui/src/components/create-cloud-storage-page/manifests-manager.tsx b/cvat-ui/src/components/create-cloud-storage-page/manifests-manager.tsx
index 7f176a11ed97..2a5809b5268d 100644
--- a/cvat-ui/src/components/create-cloud-storage-page/manifests-manager.tsx
+++ b/cvat-ui/src/components/create-cloud-storage-page/manifests-manager.tsx
@@ -93,7 +93,7 @@ export default function ManifestsManager(props: Props): JSX.Element {
                                                     {
                                                         type: 'string',
                                                         pattern: /^.*\.(jsonl)$/,
-                                                        message: 'Manifest file should be in the .jsonl format',
+                                                        message: 'Manifest file must have .jsonl extension',
                                                     },
                                                 ]}
                                                 initialValue={field.name}
diff --git a/cvat-ui/src/components/create-task-page/create-task-content.tsx b/cvat-ui/src/components/create-task-page/create-task-content.tsx
index 55c3480552d7..405ba089ec0d 100644
--- a/cvat-ui/src/components/create-task-page/create-task-content.tsx
+++ b/cvat-ui/src/components/create-task-page/create-task-content.tsx
@@ -102,13 +102,14 @@ const defaultState: State = {
 };
 
 const UploadFileErrorMessages = {
-    one: 'It can not be processed. You can upload an archive with images, a video, a pdf file or multiple images. ',
-    multi: 'It can not be processed. You can upload one or more videos. ',
+    one: 'Wrong list of files. You can upload an archive with images, a video, a pdf file or multiple images. ',
+    multi: 'Wrong list of files. You can upload one or more videos. ',
 };
 
-function fileExtensionList(files: RemoteFile[]): string {
-    const fileTypes = files.map((file: RemoteFile) => `.${file.name.split('.').pop()}`);
-    return Array.from(new Set(fileTypes)).join(', ');
+function receiveExtensions(files: RemoteFile[]): string[] {
+    const fileTypes = files.filter((file: RemoteFile) => file.name.includes('.'))
+        .map((file: RemoteFile) => `.${file.name.split('.').pop()}`);
+    return fileTypes;
 }
 
 function checkFiles(files: RemoteFile[], type: SupportedShareTypes, baseError: string): string {
@@ -116,8 +117,8 @@ function checkFiles(files: RemoteFile[], type: SupportedShareTypes, baseError: s
         (it) => it.mimeType !== type,
     );
     if (erroredFiles.length !== 0) {
-        const unsupportedTypes = fileExtensionList(erroredFiles);
-        return `${baseError} Found unsupported types: ${unsupportedTypes} `;
+        const unsupportedTypes = receiveExtensions(erroredFiles);
+        return unsupportedTypes.length ? `${baseError} Found unsupported types: ${unsupportedTypes} ` : baseError;
     }
     return '';
 }