从文件夹中只拉出20张最新照片

Question

所以我有这段代码

RESOURCE_EXHAUSTED: Quota failure for project my_project.
The requested 16.536900000000003 ML Units exceed the allowed maximum of 15.To read more about Cloud ML Engine quota, see https://cloud.google.com/ml-engine/quotas.
- '@type': type.googleapis.com/google.rpc.QuotaFailure
  violations:
  - description: The requested 16.536900000000003 ML Units exceed the allowed maximum
  of 15.
subject: my_project

它工作得很好但我想拉只有20张最新照片而不是全部照片，因为有超过一百张。

我该怎么做？ 还有一种方法可以像从5日到25日那​​样展示它吗？