Hi @sarahk ,

The negative ID for tech_signature_id is expected until the attachment record for the signature has synced with the server.  If your solution is configured correctly, the message you are showing should be in the Waiting queue and the attachment message should be in the Ready queue immediately after the client script is executed.  I’d recommend Pause Sync right before saving the signature and looking for both messages.  If you are not seeing the two messages, then review the configuration to ensure that the metadata relationship is correct between task.tech_signature_id and attachment.attachment_id. 

I don’t have access to an FSM environment anymore, so hopefully someone else can chime in if this doesn’t resolve the problem. 

This is an FSM core environmental issue. A fix for this issue is available in version 6.27.
https://support.ifs.com/csm?id=csm_ticket&table=sn_customerservice_case&sys_id=eac7d60edbf43150f38822e50596191d&view=csp