File attachment is not working.

[hiroaki2020]

I tried to attach files to msg but failed. Msg itself is processed properly but file data is not sent to server so only msg is processed.

<AssistantModal.Root
      config={{
        composer: {
          allowAttachments: true
        },
        
        ...
        <Composer.Root>
                <Composer.Attachments />
                <Composer.AddAttachment />
                <Composer.Input />
                <ThreadPrimitive.If running={false}>
                  <Composer.Send />
                </ThreadPrimitive.If>
                <ThreadPrimitive.If running>
                  <Composer.Cancel />
                </ThreadPrimitive.If>
              </Composer.Root>
      ...

I use Next.js and body parser is disabled on the route.

export const config = {
  api: {
    bodyParser: false
  }
}