Correct. I was using another Folder for my Vault that was within the 1Writer sandboxed iCloud set up, so I could use 1Writer as my Obsidian mobile app. Longer story short, I needed to create a Test folder in the Obsidian mobile sandbox and then copy the folder structure\files from 1Writer>’folder’ to Obsidian>Test, create the Vault and I’m up and running.
Thanks for the reply, though.