You can try the below combinations for the "File Name" customization as per your need. 

Rename Downloaded Files for Deduplication
Rename Downloaded Files with File Name Suffix - Toggle Setting
File Name Suffix - Excluded Object - Populated?
Result
ON
ON
Yes
{FileId}-{filenamesuffix}.{fileextension}
ON
OFF
NA
{OriginalFileName}-{FileId}.{fileextension}
OFF
ON
Yes
{filenamesuffix}.{fileextension}
OFF
OFF
NA
{OriginalFileName}.{fileextension}