I was able to load all of my certs into the new Octopus 3.11 feature except one, which generated an error that the Certificate.Subject column was too short. This was an EV certificate and had a 207 character subject, where the column holds 200.
We do apologize. I have corrected this issue.
This fix will ship with the next version of Octopus (3.11.1), which should be available tomorrow (if not, then early next week).