Indicate file has changed with background color change

When updating from either the mobile or desktop,
if you are not careful, you can smother each other entries.
A visual indication must be given so user will
click on "Refresh" before Appending and Upload.

Start by locating the UI entry points for Refresh, Append, and Upload in the ElmBox application, then trace how updates from mobile and desktop are represented. The work is done when a changed file has a visible background indication and users are prompted to refresh before appending or uploading.

Written by the indexing model from the issue text.