Can we rename the source file into Docsumo?

Yes, you can rename the source in Docsumo directly from the product after the data has been uploaded.

You can refer to this link to rename a file or folder - https://support.docsumo.com/docs/how-do-i-rename-a-filefolder-after-its-been-uploaded

If you want to rename the file automatically using some meta data from teh extracted values, you can reach out to your success manager and they will get it done for you.