Save automatically, improve mocks

CHDataManagement/Preview Content/File+Mock.swift

@@ -1,12 +1,25 @@
 
 extension FileResource {
 
+    enum Mock {
+
+        static func mockData(content: Content) -> [FileResource] {
+            [
+                FileResource(content: content, resourceImage: "image1", type: .jpg),
+                FileResource(content: content, resourceImage: "image2", type: .jpg),
+                FileResource(content: content, resourceImage: "image3", type: .jpg),
+                FileResource(content: content, resourceImage: "image4", type: .jpg),
+                FileResource(
+                    content: content,
+                    id: "my-file.txt",
+                    isExternallyStored: true,
+                    english: "Some text file",
+                    german: "Eine Textdatei")
+            ]
+        }
+    }
+
     static var mock: FileResource {
-        .init(
-            content: .mock,
-            id: "my-file.txt",
-            isExternallyStored: true,
-            english: "Some text file",
-            german: "Eine Textdatei")
+        Content.mock.files.first(where: { $0.id == "my-file.txt" })!
     }
 }