I’m also on Linux with 0.6.7 (AppImage) and can confirm the behavior.
Obsidian seems to only load external changes when loading the page (or reloading with Ctrl+R). This can result in lost data if you begin typing in the Obsidian page, since Obsidian will save the file as-is, overwriting the external changes.
I have a similar issue in that files (.md files) created in the Obsidian root folder by external apps (iAwriter on Android) are not shown in the Linux version of Obsidian (Appimage) unless I close it and open it again.
Should I create a separate thread for this or should I wait for 0.7 too?
I’m currently seeing this behavior on 0.7.3. I have the note open in Obsidian and changed it with a text editor externally. It doesn’t reflect the changes unless I switch to another note and then switch back. Is this expected behavior?