Attachment fields are ACE specific and cannot be upsized. They are one of the "abomination" data types introduced in 2007. They are quite convenient and actually intended to hold "multiple" objects, not just one. If you have only ONE signature for a document, then use either the OLE Object data type or a text field with the path to the signature file. Embedded objects bloat an ACE database so I don't recommend storing them unless you have a very limited number. Signatures are probably limited so you can store the object in the employee record.