For this use DocumentsOfRecord.dat file.
You can see step by step video to load Documents Of Record using this Link
Please find the below sample template :
METADATA|DocumentsOfRecord|SourceSystemOwner|SourceSystemId|DocumentsOfRecordId|PersonNumber|DocumentTypeId|DocumentType|Country|DocumentCode|DocumentName|DocumentNumber|DateFrom|DateTo|IssuingAuthority|IssuedDate|IssuingCountry|IssuingLocation|Comments|Publish|PublishDate|Status|VerifiedBy|VerifiedDate
MERGE|DocumentsOfRecord|XXTEST|XXTEST_DOCREC01||XXTEST2||Passport||XXTEST_DOCREC01|Passport|XXTEST2123|||||US|||||||
METADATA|DocumentAttachment|SourceSystemOwner|SourceSystemId|PersonNumber|DocumentType|Country|DocumentCode|DataTypeCode|Title|URLorTextorFileName|File
MERGE|DocumentAttachment|XXTEST|XXTEST_DOCREC01|XXTEST2|Passport||XXTEST_DOCREC01|passport.png|passport.png|FILE|passport.png
