Click Synchronize to manually merge external changes into the current file. This is useful on the desktop and with GitHub files to manually merge remote changes.
With files stored in Google Drive and OneDrive, external changes are detected and merged automatically, unless you have disabled autosave, you can ignore this function.
A refresh icon appears in the top, right corner in this case. Clicking the icon will ignore external changes.
Merging is supported on Google Drive, One Drive, GitHub (manual) and Desktop (manual). For Desktop, it will merge changes to the file (eg. when on a network drive). For all other platforms external changes will be overwritten as conflicts cannot be detected.