fix: Refactor collection exports to not send email attachment (#2460)

Co-authored-by: Tom Moor <tom.moor@gmail.com>

app/models/FileOperation.js

@@ -0,0 +1,27 @@
+// @flow
+import { computed } from "mobx";
+import BaseModal from "./BaseModel";
+import Collection from "./Collection";
+import User from "./User";
+
+class FileOperation extends BaseModal {
+  id: string;
+  state: string;
+  collection: ?Collection;
+  size: number;
+  type: string;
+  user: User;
+  createdAt: string;
+
+  @computed
+  get sizeInMB(): string {
+    const inKB = this.size / 1024;
+    if (inKB < 1024) {
+      return inKB.toFixed(2) + "KB";
+    }
+
+    return (inKB / 1024).toFixed(2) + "MB";
+  }
+}
+
+export default FileOperation;