Default location for new attachemnts
in subfolder under current folder
Work Around Only have a single Obsidian instance open at a time. Then when you open obsidian on a new device after the setting has been saved you will see the updated setting as expected.
As far as this bug report goes, we don’t provide explicit support for third party sync solution.
For this specific issue, I suggest you open a Feature Request asking for supporting live reloading of settings files when they are modified externally.