[Feature] iOS access phone filesystem

[joethei]

The KeePassium app only needs access to one file, while Obsidian needs access to an entire folder, with all its subfolders.
This uses different API’s.

Thanks to App Sandboxing and those cloud storage providers not using the required iOS API’s, this is not possible.

See this reply:

Mobile (iOS, Android) Applications

It is not that simple, sadly. While many iOS cloud file providers allow you to add files from their storage to other apps, almost none allow you to add or use folders. The only iOS file provider that makes full use of iOS APIs for this purpose is Working Copy, as far as I know. I don’t have experience with the services you describe, but I tested Synology Drive just now and my suspicions are correct. I imagine it’s the same for the others. So, sadly, until other cloud storage providers properl…

And this section on the page you linked:

Sync your notes across devices - Obsidian Help