The Files app on iOS and iPadOS does not have any options for displaying hidden folders. This means that the .obsidian folder that Obsidian uses to keep track of Vault information is inaccessible.
A post on the Club Macstories[1] website pointed out that Working Copy can be used to access these hidden folders via its Linked Repositories feature.
This works because Working Copy hooks in to iOS as a registered file provider, and because Linked Repositories do not have to be Git repositories. They can be any folder. So, after configuring a Linked Repository that points at the Obsidian folder in iCloud I can browse to that folder in Files via the Working Copy section and see all of my Obsidian vaults.
This is useful for adding and updating CSS snippets and plugins that aren't in the Obsidian Community plugins section or BRAT yet.
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