In order to access documents uploaded during a separate onboarding programme, you need to swap the learner back to the onboarding programme, download the documents, then re-assign them back to their delivery programme.
This needs to be done in in Classic.
Please note that the 'Stop Programme' function in Console is not currently suitable if you intend to re-apply a learner to the same programme.
The new stop programme function in Console will force a withdrawal from the delivery programme and this will cause an ILR issue since it will not be reversed when the programme is re-applied.