diff --git a/src/api/approval/instance/index.ts b/src/api/approval/instance/index.ts
index ac73f01..6d378b8 100644
--- a/src/api/approval/instance/index.ts
+++ b/src/api/approval/instance/index.ts
@@ -52,6 +52,19 @@ export async function saveDocument(flowCode: string, data: Record<string, any>)
   return Promise.reject(new Error(res.data.message));
 }
 
+/**
+ * 只建空草稿，返回实例id。上传附件前需要实例，但不校验表单字段。
+ */
+export async function createEmptyDraft(flowCode: string) {
+  const res = await request.post<ApiResult<number>>(
+    THINK_API_URL + '/approval/instance/' + flowCode + '/draft'
+  );
+  if (res.data.code === 0) {
+    return res.data.data as number;
+  }
+  return Promise.reject(new Error(res.data.message));
+}
+
 /**
  * 提交或重提
  */
diff --git a/src/packageApproval/pages/form-completion.vue b/src/packageApproval/pages/form-completion.vue
index 26ed216..3f93402 100644
--- a/src/packageApproval/pages/form-completion.vue
+++ b/src/packageApproval/pages/form-completion.vue
@@ -101,6 +101,7 @@ import { computed, reactive, ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import { useUserStore } from '@/store/modules/user';
 import {
+  createEmptyDraft,
   getInstance,
   saveCompletion,
   submitInstance
@@ -224,6 +225,24 @@ async function ensureDraft(): Promise<number> {
   }
 }
 
+/**
+ * 上传附件只需要实例 id：不校验表单，未建实例时先建空草稿
+ */
+async function ensureInstance(): Promise<number> {
+  if (instanceId.value) {
+    return instanceId.value;
+  }
+  try {
+    const id = await createEmptyDraft('completion');
+    instanceId.value = id;
+    mode.value = 'edit';
+    return id;
+  } catch (error: any) {
+    showError(error?.message || '创建草稿失败', null);
+    return 0;
+  }
+}
+
 async function saveDraft() {
   const id = await ensureDraft();
   if (!id) {
@@ -330,7 +349,7 @@ async function uploadFiles(files: Array<{ path: string; name?: string; size?: nu
   if (!files.length) {
     return;
   }
-  const id = await ensureDraft();
+  const id = await ensureInstance();
   if (!id) {
     return;
   }
diff --git a/src/packageApproval/pages/form-coordination.vue b/src/packageApproval/pages/form-coordination.vue
index 7d31d6b..3b2a916 100644
--- a/src/packageApproval/pages/form-coordination.vue
+++ b/src/packageApproval/pages/form-coordination.vue
@@ -112,6 +112,7 @@ import { computed, reactive, ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import { useUserStore } from '@/store/modules/user';
 import {
+  createEmptyDraft,
   getInstance,
   saveCoordination,
   saveDocument,
@@ -296,6 +297,24 @@ async function ensureDraft(): Promise<number> {
   }
 }
 
+/**
+ * 上传附件只需要实例 id：不校验表单，未建实例时先建空草稿
+ */
+async function ensureInstance(): Promise<number> {
+  if (instanceId.value) {
+    return instanceId.value;
+  }
+  try {
+    const id = await createEmptyDraft(flowCode.value);
+    instanceId.value = id;
+    mode.value = 'edit';
+    return id;
+  } catch (error: any) {
+    showError(error?.message || '创建草稿失败', null);
+    return 0;
+  }
+}
+
 async function saveDraft() {
   const id = await ensureDraft();
   if (!id) {
@@ -402,7 +421,7 @@ async function uploadFiles(files: Array<{ path: string; name?: string; size?: nu
   if (!files.length) {
     return;
   }
-  const id = await ensureDraft();
+  const id = await ensureInstance();
   if (!id) {
     return;
   }
diff --git a/src/packageApproval/pages/form-coupon.vue b/src/packageApproval/pages/form-coupon.vue
index 4484615..ba6c510 100644
--- a/src/packageApproval/pages/form-coupon.vue
+++ b/src/packageApproval/pages/form-coupon.vue
@@ -121,7 +121,12 @@
 import { computed, reactive, ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import { useUserStore } from '@/store/modules/user';
-import { getInstance, saveDocument, submitInstance } from '@/api/approval/instance';
+import {
+  createEmptyDraft,
+  getInstance,
+  saveDocument,
+  submitInstance
+} from '@/api/approval/instance';
 import { deleteAttachment, uploadAttachment } from '@/api/approval/attachment';
 import type { ApprovalAttachment } from '@/api/approval/model';
 import { showError, showSuccess } from '@/utils/app';
@@ -308,6 +313,24 @@ async function ensureDraft(): Promise<number> {
   }
 }
 
+/**
+ * 上传附件只需要实例 id：不校验表单，未建实例时先建空草稿
+ */
+async function ensureInstance(): Promise<number> {
+  if (instanceId.value) {
+    return instanceId.value;
+  }
+  try {
+    const id = await createEmptyDraft(FLOW_CODE);
+    instanceId.value = id;
+    mode.value = 'edit';
+    return id;
+  } catch (error: any) {
+    showError(error?.message || '创建草稿失败', null);
+    return 0;
+  }
+}
+
 async function saveDraft() {
   const id = await ensureDraft();
   if (!id) {
@@ -414,7 +437,7 @@ async function uploadFiles(files: Array<{ path: string; name?: string; size?: nu
   if (!files.length) {
     return;
   }
-  const id = await ensureDraft();
+  const id = await ensureInstance();
   if (!id) {
     return;
   }
diff --git a/src/packageApproval/pages/form-facility.vue b/src/packageApproval/pages/form-facility.vue
index cdb302e..3985fb0 100644
--- a/src/packageApproval/pages/form-facility.vue
+++ b/src/packageApproval/pages/form-facility.vue
@@ -164,7 +164,12 @@ import { computed, reactive, ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import Decimal from 'decimal.js';
 import { useUserStore } from '@/store/modules/user';
-import { getInstance, saveDocument, submitInstance } from '@/api/approval/instance';
+import {
+  createEmptyDraft,
+  getInstance,
+  saveDocument,
+  submitInstance
+} from '@/api/approval/instance';
 import { deleteAttachment, uploadAttachment } from '@/api/approval/attachment';
 import type { ApprovalAttachment } from '@/api/approval/model';
 import { showError, showSuccess } from '@/utils/app';
@@ -383,6 +388,24 @@ async function ensureDraft(): Promise<number> {
   }
 }
 
+/**
+ * 上传附件只需要实例 id：不校验表单，未建实例时先建空草稿
+ */
+async function ensureInstance(): Promise<number> {
+  if (instanceId.value) {
+    return instanceId.value;
+  }
+  try {
+    const id = await createEmptyDraft(FLOW_CODE);
+    instanceId.value = id;
+    mode.value = 'edit';
+    return id;
+  } catch (error: any) {
+    showError(error?.message || '创建草稿失败', null);
+    return 0;
+  }
+}
+
 async function saveDraft() {
   const id = await ensureDraft();
   if (!id) {
@@ -489,7 +512,7 @@ async function uploadFiles(files: Array<{ path: string; name?: string; size?: nu
   if (!files.length) {
     return;
   }
-  const id = await ensureDraft();
+  const id = await ensureInstance();
   if (!id) {
     return;
   }
diff --git a/src/packageApproval/pages/form-receipt.vue b/src/packageApproval/pages/form-receipt.vue
index 19679ba..73c3359 100644
--- a/src/packageApproval/pages/form-receipt.vue
+++ b/src/packageApproval/pages/form-receipt.vue
@@ -111,7 +111,12 @@
 import { computed, reactive, ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import { useUserStore } from '@/store/modules/user';
-import { getInstance, saveDocument, submitInstance } from '@/api/approval/instance';
+import {
+  createEmptyDraft,
+  getInstance,
+  saveDocument,
+  submitInstance
+} from '@/api/approval/instance';
 import { deleteAttachment, uploadAttachment } from '@/api/approval/attachment';
 import type { ApprovalAttachment } from '@/api/approval/model';
 import { showError, showSuccess } from '@/utils/app';
@@ -234,6 +239,24 @@ async function ensureDraft(): Promise<number> {
   }
 }
 
+/**
+ * 上传附件只需要实例 id：不校验表单，未建实例时先建空草稿
+ */
+async function ensureInstance(): Promise<number> {
+  if (instanceId.value) {
+    return instanceId.value;
+  }
+  try {
+    const id = await createEmptyDraft(FLOW_CODE);
+    instanceId.value = id;
+    mode.value = 'edit';
+    return id;
+  } catch (error: any) {
+    showError(error?.message || '创建草稿失败', null);
+    return 0;
+  }
+}
+
 async function saveDraft() {
   const id = await ensureDraft();
   if (!id) {
@@ -340,7 +363,7 @@ async function uploadFiles(files: Array<{ path: string; name?: string; size?: nu
   if (!files.length) {
     return;
   }
-  const id = await ensureDraft();
+  const id = await ensureInstance();
   if (!id) {
     return;
   }
diff --git a/src/packageApproval/pages/form-settlement.vue b/src/packageApproval/pages/form-settlement.vue
index e4dabe0..13f424e 100644
--- a/src/packageApproval/pages/form-settlement.vue
+++ b/src/packageApproval/pages/form-settlement.vue
@@ -195,7 +195,12 @@ import { computed, reactive, ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import Decimal from 'decimal.js';
 import { useUserStore } from '@/store/modules/user';
-import { getInstance, saveDocument, submitInstance } from '@/api/approval/instance';
+import {
+  createEmptyDraft,
+  getInstance,
+  saveDocument,
+  submitInstance
+} from '@/api/approval/instance';
 import { deleteAttachment, uploadAttachment } from '@/api/approval/attachment';
 import type { ApprovalAttachment } from '@/api/approval/model';
 import { showError, showSuccess } from '@/utils/app';
@@ -429,6 +434,24 @@ async function ensureDraft(): Promise<number> {
   }
 }
 
+/**
+ * 上传附件只需要实例 id：不校验表单，未建实例时先建空草稿
+ */
+async function ensureInstance(): Promise<number> {
+  if (instanceId.value) {
+    return instanceId.value;
+  }
+  try {
+    const id = await createEmptyDraft(FLOW_CODE);
+    instanceId.value = id;
+    mode.value = 'edit';
+    return id;
+  } catch (error: any) {
+    showError(error?.message || '创建草稿失败', null);
+    return 0;
+  }
+}
+
 async function saveDraft() {
   const id = await ensureDraft();
   if (!id) {
@@ -535,7 +558,7 @@ async function uploadFiles(files: Array<{ path: string; name?: string; size?: nu
   if (!files.length) {
     return;
   }
-  const id = await ensureDraft();
+  const id = await ensureInstance();
   if (!id) {
     return;
   }
diff --git a/src/packageApproval/pages/form-vehicle.vue b/src/packageApproval/pages/form-vehicle.vue
index a459ca1..0c34a7a 100644
--- a/src/packageApproval/pages/form-vehicle.vue
+++ b/src/packageApproval/pages/form-vehicle.vue
@@ -186,7 +186,12 @@
 import { computed, ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import { useUserStore } from '@/store/modules/user';
-import { getInstance, saveDocument, submitInstance } from '@/api/approval/instance';
+import {
+  createEmptyDraft,
+  getInstance,
+  saveDocument,
+  submitInstance
+} from '@/api/approval/instance';
 import { deleteAttachment, uploadAttachment } from '@/api/approval/attachment';
 import type { ApprovalAttachment } from '@/api/approval/model';
 import { showError, showSuccess } from '@/utils/app';
@@ -411,6 +416,24 @@ async function ensureDraft(): Promise<number> {
   }
 }
 
+/**
+ * 上传附件只需要实例 id：不校验表单，未建实例时先建空草稿
+ */
+async function ensureInstance(): Promise<number> {
+  if (instanceId.value) {
+    return instanceId.value;
+  }
+  try {
+    const id = await createEmptyDraft(FLOW_CODE);
+    instanceId.value = id;
+    mode.value = 'edit';
+    return id;
+  } catch (error: any) {
+    showError(error?.message || '创建草稿失败', null);
+    return 0;
+  }
+}
+
 async function saveDraft() {
   const id = await ensureDraft();
   if (!id) {
@@ -517,7 +540,7 @@ async function uploadFiles(files: Array<{ path: string; name?: string; size?: nu
   if (!files.length) {
     return;
   }
-  const id = await ensureDraft();
+  const id = await ensureInstance();
   if (!id) {
     return;
   }
diff --git a/src/packageApproval/pages/form-venue.vue b/src/packageApproval/pages/form-venue.vue
index 488eb22..7e4ac8e 100644
--- a/src/packageApproval/pages/form-venue.vue
+++ b/src/packageApproval/pages/form-venue.vue
@@ -147,7 +147,12 @@
 import { computed, reactive, ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import { useUserStore } from '@/store/modules/user';
-import { getInstance, saveDocument, submitInstance } from '@/api/approval/instance';
+import {
+  createEmptyDraft,
+  getInstance,
+  saveDocument,
+  submitInstance
+} from '@/api/approval/instance';
 import { deleteAttachment, uploadAttachment } from '@/api/approval/attachment';
 import { listThinkSite } from '@/api/think/thinkSite';
 import type { ApprovalAttachment } from '@/api/approval/model';
@@ -379,6 +384,24 @@ async function ensureDraft(): Promise<number> {
   }
 }
 
+/**
+ * 上传附件只需要实例 id：不校验表单，未建实例时先建空草稿
+ */
+async function ensureInstance(): Promise<number> {
+  if (instanceId.value) {
+    return instanceId.value;
+  }
+  try {
+    const id = await createEmptyDraft(FLOW_CODE);
+    instanceId.value = id;
+    mode.value = 'edit';
+    return id;
+  } catch (error: any) {
+    showError(error?.message || '创建草稿失败', null);
+    return 0;
+  }
+}
+
 async function saveDraft() {
   const id = await ensureDraft();
   if (!id) {
@@ -485,7 +508,7 @@ async function uploadFiles(files: Array<{ path: string; name?: string; size?: nu
   if (!files.length) {
     return;
   }
-  const id = await ensureDraft();
+  const id = await ensureInstance();
   if (!id) {
     return;
   }