Can I change the repository for task gateway odata service of attachment

Hi Expert,

I have find there is odata service which provide by task gateway to handle attachment:

AttachmentCollection(SAP__Origin = ‘<system_alias>’, InstanceID='<workitem_id>',id='<Attachment_id>')/$value

I wonder where these attachment stored?

Is there anyway I can change the repository for these attachment by configuration?

So as for the odata service about comment .

Thanks in advance.

Best regards,

Aria