diff --git a/packages/hydrooj/src/entry/master.ts b/packages/hydrooj/src/entry/master.ts
index 686937bb..72df7aec 100644
--- a/packages/hydrooj/src/entry/master.ts
+++ b/packages/hydrooj/src/entry/master.ts
@@ -75,7 +75,10 @@ export async function load(call: Entry) {
         logger.info('Upgrading database: from %d to %d', dbVer, expected);
         if (isFresh) {
             const func = scripts[dbVer].toString();
-            if (func.includes('_FRESH_INSTALL_IGNORE')) continue;
+            if (func.includes('_FRESH_INSTALL_IGNORE')) {
+                dbVer++;
+                continue;
+            }
         }
         const result = await scripts[dbVer]();
         if (!result) break;
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index 2786792b..2a31eae6 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -92,7 +92,7 @@ export interface User extends Dictionary<any> {
 
 export type Udict = NumericDictionary<User>;
 
-export interface ProblemData {
+export interface FileInfo {
     name: string,
     size: number,
 }
@@ -172,7 +172,8 @@ declare module './model/problem' {
         nAccept: number,
         tag: string[],
         category: string[],
-        data: ProblemData[],
+        data: FileInfo[],
+        additional_file: FileInfo[],
         hidden: boolean,
         acMsg?: string,
         html?: boolean,
diff --git a/packages/hydrooj/src/model/problem.ts b/packages/hydrooj/src/model/problem.ts
index ecebc18c..71b1e116 100644
--- a/packages/hydrooj/src/model/problem.ts
+++ b/packages/hydrooj/src/model/problem.ts
@@ -158,6 +158,18 @@ export async function delTestdata(domainId: string, pid: number, name: string |
     await pull(domainId, pid, 'data', names);
 }
 
+export async function addAdditionalFile(domainId: string, pid: number, name: string, f: Readable | Buffer | string) {
+    await storage.put(`problem/${domainId}/${pid}/additional_file/${name}`, f);
+    const meta = await storage.getMeta(`problem/${domainId}/${pid}/additional_file/${name}`);
+    return await push(domainId, pid, 'additional_file', meta);
+}
+
+export async function delAdditionalFile(domainId: string, pid: number, name: string | string[]) {
+    const names = name instanceof Array ? name : [name];
+    await storage.del(names.map((t) => `problem/${domainId}/${pid}/additional_file/${t}`));
+    await pull(domainId, pid, 'additional_file', names);
+}
+
 export async function random(domainId: string, query: FilterQuery<Pdoc>): Promise<string | null> {
     const cursor = document.getMulti(domainId, document.TYPE_PROBLEM, query);
     const pcount = await cursor.count();
@@ -239,6 +251,8 @@ global.Hydro.model.problem = {
     random,
     addTestdata,
     delTestdata,
+    addAdditionalFile,
+    delAdditionalFile,
     getMulti,
     getList,
     getListStatus,
diff --git a/packages/hydrooj/src/upgrade.ts b/packages/hydrooj/src/upgrade.ts
index 55207187..8aecc61b 100644
--- a/packages/hydrooj/src/upgrade.ts
+++ b/packages/hydrooj/src/upgrade.ts
@@ -119,33 +119,6 @@ const scripts: UpgradeScript[] = [
             }
             domainProgress.stop();
         }
-        const udocs = await user.getMulti().project({ _id: 1, uname: 1 }).toArray();
-        const userfileProgress = Progress.create({
-            items: udocs.length, title: 'Users', y: 3,
-        });
-        for (const udoc of udocs) {
-            userfileProgress.startItem(`${udoc._id}: ${udoc.uname}`);
-            const ufdocs = await coll.find({ owner: udoc._id }).toArray();
-            const currentUser = Progress.create({
-                items: ufdocs.length, title: `${udoc._id}: ${udoc.uname}`, y: 4, eta: true,
-            });
-            const namelist = [];
-            for (const ufdoc of ufdocs) {
-                currentUser.startItem(`${ufdoc._id}: ${ufdoc.filename || ''}`);
-                ufdoc.filename = ufdoc.filename || ufdoc._id.toHexString();
-                const file = await streamToBuffer(gridfs.openDownloadStream(ufdoc._id));
-                if (!namelist.includes(ufdoc.filename)) {
-                    await storage.put(`user/${udoc._id}/${ufdoc.filename}`, file);
-                } else {
-                    await storage.put(`user/${udoc._id}/${ufdoc._id}`, file);
-                }
-                namelist.push(ufdoc.filename);
-                currentUser.itemDone(`${ufdoc._id}: ${ufdoc.filename || ''}`);
-            }
-            currentUser.stop();
-            userfileProgress.itemDone(`${udoc._id}: ${udoc.uname}`);
-        }
-        userfileProgress.stop();
         logger.success('Files copied successfully. You can now remove collection `file` `fs.files` `fs.chunks` in the database.');
         return true;
     },
@@ -176,7 +149,7 @@ const scripts: UpgradeScript[] = [
             await storage.get(dst)
                 .catch(() => {
                     const cfg = yaml.dump(pdoc.config);
-                    return storage.put(dst, Buffer.from(cfg));
+                    return problem.addTestdata(pdoc.domainId, pdoc.docId, 'config.yaml', Buffer.from(cfg));
                 });
         });
         return true;
diff --git a/packages/import-qduoj/handler.ts b/packages/import-qduoj/handler.ts
index c8bdcecc..87befb79 100644
--- a/packages/import-qduoj/handler.ts
+++ b/packages/import-qduoj/handler.ts
@@ -82,14 +82,16 @@ class ImportQduojHandler extends Handler {
                     subtasks: [],
                 };
                 for (const tc of pdoc.test_case_score) {
-                    await storage.put(
-                        `problem/${domainId}/${pid}/testdata/${tc.input_name}`,
-                        path.join(tmp, folder, 'testcase', tc.input_name),
-                    );
-                    await storage.put(
-                        `problem/${domainId}/${pid}/testdata/${tc.output_name}`,
-                        path.join(tmp, folder, 'testcase', tc.output_name),
-                    );
+                    await Promise.all([
+                        problem.addTestdata(
+                            domainId, pid, tc.input_name,
+                            path.join(tmp, folder, 'testcase', tc.input_name),
+                        ),
+                        problem.addTestdata(
+                            domainId, pid, tc.output_name,
+                            path.join(tmp, folder, 'testcase', tc.output_name),
+                        ),
+                    ]);
                     config.subtasks.push({
                         score: tc.score,
                         cases: [{
@@ -98,12 +100,10 @@ class ImportQduojHandler extends Handler {
                         }],
                     });
                 }
-                await storage.put(
-                    `problem/${domainId}/${pid}/testdata/config.yaml`,
-                    Buffer.from(yaml.dump(config)),
-                );
-                const data = await storage.list(`problem/${domainId}/${pid}/testdata/`, true);
-                await problem.edit(domainId, pid, { html: true, data });
+                await Promise.all([
+                    problem.addTestdata(domainId, pid, 'config.yaml', Buffer.from(yaml.dump(config))),
+                    problem.edit(domainId, pid, { html: true }),
+                ]);
             }
         } catch (e) {
             console.error(e);