Many users get confused on how to see the attachment run steps.
Attachments made to Steps during the run are attached to the Run Step History.
To see the attachment added to a test step during the run...
1) After the run, In the Test Lab Execution Grid, Display the Test Instance properties window. This can be done by clicking the Test Instance Properties icon in the menubar above the Test Execution Grid or with a doubleclick on the row for the test.
2) On the Test Instance properties window
a. Select the All Runs icon and highlight the run.
b. Show the Run Steps by clicking the ''Show Run Steps'' icon or by doubleclicking the run. The Run Steps Window appears.
3) On the Run Steps Window, select the step and then click the Attachments icon to see the attachments made to the test step during the run.