diff --git a/src/utils/uploader.ts b/src/utils/uploader.ts
index 4e026b0..2bbddbb 100644
--- a/src/utils/uploader.ts
+++ b/src/utils/uploader.ts
@@ -32,8 +32,9 @@ export async function uploadFile(file: File, options: UploadFileOptions = {}): P
     bizType
   })
   const info = initRes.data
+  const chunkSize = Number(info.chunkSize)
   options.onSession?.(info.uploadId)
-  const total = Math.max(info.totalChunks, 1)
+  const total = Math.max(Number(info.totalChunks), 1)
   const pending: number[] = Array.from({ length: total }, (_, index) => index)
   let finished = 0
 
@@ -41,8 +42,8 @@ export async function uploadFile(file: File, options: UploadFileOptions = {}): P
     for (;;) {
       const index = pending.shift()
       if (index === undefined) return
-      const start = index * info.chunkSize
-      const chunk = file.slice(start, Math.min(start + info.chunkSize, file.size))
+      const start = index * chunkSize
+      const chunk = file.slice(start, Math.min(start + chunkSize, file.size))
       await uploadChunkApi(info.uploadId, index, chunk, file.name)
       finished += 1
       onProgress?.(Math.min(95, Math.round((finished / total) * 95)))
@@ -68,7 +69,8 @@ export async function resumeUpload(
 ): Promise<MediaAsset> {
   const { concurrency = 3, onProgress } = options
   const progress = (await getUploadProgressApi(uploadId)).data
-  const total = Math.max(progress.totalChunks, 1)
+  const chunkSize = Number(progress.chunkSize)
+  const total = Math.max(Number(progress.totalChunks), 1)
   const received = Math.min(progress.receivedChunks || 0, total)
   const pending: number[] = []
   for (let index = received; index < total; index += 1) {
@@ -81,8 +83,8 @@ export async function resumeUpload(
     for (;;) {
       const index = pending.shift()
       if (index === undefined) return
-      const start = index * progress.chunkSize
-      const chunk = file.slice(start, Math.min(start + progress.chunkSize, file.size))
+      const start = index * chunkSize
+      const chunk = file.slice(start, Math.min(start + chunkSize, file.size))
       await uploadChunkApi(uploadId, index, chunk, file.name)
       finished += 1
       onProgress?.(Math.min(95, Math.round((finished / total) * 95)))