File uploading in DMS via SAP CAP -- Error - File not supported

Hello Everyone

I successfully uploaded the file in DMS service using SAP CAP (nodejs) but when I try to open the file ( after downloading using SAP UI5 app ) I got error error "file not supported".

Code Snippet

I referred the code mentioned in

https://github.com/gregorwolf/bookshop-demo/blob/main/srv/dms-service.js