This is due to the way records from Raiser's edge are created compared to those in Altru. The comment section has been moved to the documentation tab and can be found following the steps below.
  1. Navigate to Constituents > Constituent search
  2. Find and open your Constituent record
  3. Click the Documentation and Interactions tab
  4. Select Interactions
  5. Find a note from pre-Altru
  6. Click on the hyperlink underneath Summary
  7. Click on the Documentation tab
  8. See that the information about the interaction is located here