Userscripts folder cannot be OneDrive (greyed out)

[BartmanEH]

MS OneDrive is the only app on iOS that allows you to "Make Available Offiline". iCloud Drive files eventually get removed from the device. Frequently, my userscripts for a page won't run because they've been removed. So for now I've been using a folder "On My iPhone" but this is inconvenient because it's not sync'd with my other systems. Everytime I update a script on another systems, I have to manually copy it into the "On My iPhone" folder. If I was able to select the OneDrive folder, I would have a way to keep scripts sync'd across devices and keep them on my iPhone:
Screenshot showing the OneDrive option to "Make Available Offline":

Screenshot showing that the OneDrive folder cannot be selected in Userscripts->Set Userscripts Directory

I'm hoping there's a simple reason why Userscripts setup cannot select a OneDrive folder and that this could be added.

[ACTCD]

The reason is indeed simple, but it is not something we can solve.
Which is that the third-party file provider does not provide open-in-place supports.

Instead, this extension supports you to open and edit documents in-place from any third-party app.

References:
https://developer.apple.com/documentation/uikit/view_controllers/providing_access_to_directories
https://developer.apple.com/documentation/uikit/uidocumentpickerviewcontroller

Duplicate of #234

[BartmanEH]

so how are people synchronizing scripts across platforms? iCloud is useless.

[ACTCD]

We're tracking this in issue: #520