Data extraction on hand written document not working

Hi All

I am working on version 23.3. My use case is to extract data from a PDF file; the data can be both hand written or system written. In case the content is system written; after few runs; the system is able to extract certain amount of data from the PDF (which is the expected behaviour from AI Document Extraction). However, if my input PDF document is hand written; no data gets extracted after multiple cycle runs as well. Can any one please guide as to how I can achieve data extraction from hand written document as well or what am I missing to achieve my goal. I am referring to the following link to achieve my goal (Note: Currently trying to capture PDF data in CDT; not in record for my POC):

Create a Document Extraction AI Skill - Appian 23.3

Thanks in advance!!