diff --git a/packages/engine-chronocat-api/src/common/file.ts b/packages/engine-chronocat-api/src/common/file.ts
index 78bb3ce..df1843a 100644
--- a/packages/engine-chronocat-api/src/common/file.ts
+++ b/packages/engine-chronocat-api/src/common/file.ts
@@ -177,7 +177,7 @@ async function saveFile(
   },
   fileName: string,
 ) {
-  const filePath = await generateFilePath(ctx, fileName)
+  const filePath = await commonGenerateUploadPath(ctx, fileName)
   await finished(file.pipe(createWriteStream(filePath)))
   return filePath
 }
@@ -187,12 +187,15 @@ async function saveBuffer(
   buffer: Buffer,
   fileName: string,
 ) {
-  const filePath = await generateFilePath(ctx, fileName)
+  const filePath = await commonGenerateUploadPath(ctx, fileName)
   await writeFile(filePath, buffer)
   return filePath
 }
 
-async function generateFilePath(ctx: ChronocatContext, fileName: string) {
+export async function commonGenerateUploadPath(
+  ctx: ChronocatContext,
+  fileName: string,
+) {
   const dir = join(ctx.chronocat.baseDir, 'tmp/upload')
   await mkdir(dir, {
     recursive: true,
diff --git a/packages/engine-chronocat-api/src/common/index.ts b/packages/engine-chronocat-api/src/common/index.ts
index e347788..a78192b 100644
--- a/packages/engine-chronocat-api/src/common/index.ts
+++ b/packages/engine-chronocat-api/src/common/index.ts
@@ -1,4 +1,4 @@
-import { commonFile } from './file'
+import { commonFile, commonGenerateUploadPath } from './file'
 import { commonSave } from './save'
 import { commonSend, commonSendForward } from './send'
 
@@ -7,6 +7,7 @@ export const common = {
   sendForward: commonSendForward,
   save: commonSave,
   file: commonFile,
+  generateUploadPath: commonGenerateUploadPath,
 } as const
 
 export type Common = typeof common