When PDF Merge completes the merge process and generates the temporary merge file, the merge file appears in the Adobe Acrobat window. In the upper-left corner of the file, an Information 
, Warning 
, or Error 
icon appears.
Tip: If the Information icon is not visible, Adobe Acrobat comments may be hidden. To display comments, select View > Comments > Show All Comments.
Information icons appear when the merge was successful and no problems were encountered. Warning icons appear when the merge encountered a problem but was still able to complete the process. Error icons appear when the merge encountered a problem and was not able to complete the process.