Select the files to use on the left and right sides of the comparison. You can add multiple files to one of the sides (but not to both sides). You would typically add the original (or older) files on the left and the modified (or newer) files on the right.
On the left and right sides:
1. To select a file, click Browse.
2. To upload a file, click Upload or drag-and-drop the file on the Compare window.
3. To remove a file, hover over the file in the Selected Files area, then click 
.
The Selected Files areas show the files that will be used for the left and right sides of the comparison. For each file, you can select the version to use.
1. Click 
beside the filename.
2. Select a version.