When the DICOM for a study has empty values for (0020,0013) Instance Number, the snapshot service fails to generate snapshots. You can recreate this by:
- (Optional) Import a normal study with instance numbers, and double check that snapshot generation works fine for it.
- Set a project's anon script to clear out instance numbers with this script: (0020,0013) := ""
- Upload the same study from the optional step to this project.
- Click on the link for the scan, and you'll notice snapshot generation doesn't work.