The "on sdcard" column remains blank in the current implementation.
I believe the plan was to indicate if the corresponding filedate on the sdcard matches the filedate of the patch, and skipping patches that already are up-to-date on the card, when doing a bulk upload. But a patch bank bulk upload hasn't been implemented yet.
There should not be a need to rename anything on sdcard. After creating a patch bank, you need to select patches in the bank and press "Upload" (bottom right button) one-by-one, and "Upload bank table". References in the bank table are by name, so re-ordering, adding and removing patches does not require re-upload of the patch.
Known broken in the patch bank editor is that it will keep asking to save the patch bank file.