You are observing that the SuccessFactors termination attachment is lost after the workflow is approved. This is one known issue.
SAP SuccessFactors Employee Central
Reproducing the Issue
Import termination details template with an existing attachment id.
Go to workflow page, we can see the attachment there.
Approve the workflow go to employees' profile page, no attachment found.
The same is also observed via OData API queries.
SF engineering have plans to adopt the termination import on Centralized services in b2205 and then will cover this gap. The current status is that SF engineering is planning the fix into future release 1H 2022.
Please note that in future communications with SAP, you can ask to check the Engineering ticket number ECT-166471 to track the progress of it.
Termination attachment disappears after workflow is approved - SuccessFactors Employee Central, ECT-166471 , KBA , LOD-SF-INT-EC , Employee Central SFAPI & OData Entities , LOD-SF-INT , Integrations , LOD-SF-EC , Employee Central , Known Error