拍照申请存储权限

## Current use version？
#### 当前使用的版本是多少？

```
v2.7.3-rc07
```

## Will this problem occur in demo?
#### Demo能否复现这问题？

```
能
```

## Describe the problem or provide an error log？
#### 描述问题或提供错误log？

```
拍照需要存储权限，能修改保存目录吗，不申请存储
```

Start by reproducing the camera capture flow in the demo on v2.7.3-rc07 and trace where it requests storage permission and chooses the save directory. Done means captured photos can be saved through a configurable or approved location without requesting unnecessary storage permission, with the demo behavior verified.

Written by the indexing model from the issue text.