I need to sync Prod data with test environment but challenge is for documents

I have requirement where i need to  sync Prod data in Test environment to perform load, performance and some functional testing. Issue is with Documents which are large in number.

All these are transaction data saved during workflow in Prod and we need to use same in test environment to check the performance or load.

SQL data can be copied which is in Million record. As documents are saved with ID in table, is there any way to copy Environment specific data(Which is of large volume) as it is into target env?