wx.chooseMedia({
  count: 1,
  mediaType: ['image'],
  sourceType: ['camera'],
  camera: 'front',
  sizeType: ['compressed'],
  success: async ({ tempFiles }) => {
    if (tempFiles && tempFiles.length) {
      ...
    }
  },
  fail({ errMsg }) {
    if (errMsg !== 'chooseMedia:fail cancel') {
      wx.showModal({
        title: '选取失败',
        content: '请检查是否开启允许微信访问系统相册权限' + errMsg
      })
    }
  }
})

机型和基础库未知