I have a desktop PC I use as my “server” for notes and such. They are synced across my Macbook and iOS devices using Resilio Sync.
On iOS, Resilio Sync stores the folders I sync in its own folder of “On My iPhone” (in the “Files” app). However, the Obsidian iOS app can only interact with folders in its own iOS “Files” folder, and can’t open a vault from another folder on the device.
PC and Mac versions of Obsidian let you choose a folder on your filesystem to open an existing vault. I feel like iOS could (technically) support this too.
As an example Readdle’s “Documents” and “PDF Expert” iOS apps can access any folders/files (even if in a different folder) on the device that the user gives them access to (via an alert prompt). The following two screenshots are both taken from the Readdle “Documents” app:
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I can easily see the iOS “Files” and navigate into it.
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I can navigate to any other folder on my iOS device, not just in the “Documents” app folder.
Also: I checked for any duplicates of this before posting, and all of the previous ones that did exist are now closed and I can’t comment on them.