To download multiple files from a certain file upload field or image upload field of your existing records in a sheet, you can navigate to the listing page while browsing your database, and click Tools > Export > Download attachments.
Choosing the field you want to download, for example, you would like to download all the files in the Document Review Request. This will generate a .zip file that contains all the files from the field you selected.
You can also download mapping file as a .zip file by clicking Add Mapping File and selecting the corresponding key field.