Cannot upload folder on iOS

on ios you cannot upload a folder through up2k because it opens the file selector thing and not the folder selector thing

i actually haven't tried the basic uploader but i would imagine the same issue arises since on desktop the unstylized file uploader button appears and yup

**Describe the idea / solution you'd like**
on desktop, clicking the file share button thing in up2k lets you choose between folder and file upload, maybe adapt the solution to ios? yup

**Additional context**
localsend https://github.com/localsend/localsend does let you select folders on ios and that's open source so you might take a look at that maybe perchance yup

这个 issue 是关于 iOS 上的上传 UI 不允许选择文件夹的问题。查看 uploader 的前端代码，可能位于 JavaScript/HTML 中，并与 Localsend 在 iOS 上实现文件夹选择的方式进行比较。检查 up2k 组件和 basic uploader。需要在 iOS 设备或模拟器上进行测试，以验证修复是否有效。

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