How to copy wt files from another mongo instance?
The WiredTiger.wt file is a crucial metadata file that keeps track of the state of the whole database and all the *.wt files. Hence, the content of this file is deployment specific, and not transferable to other deployments. It is not possible to recreate the content of this file.

If you have a known good backup of the whole dbpath, you may be able to restore to a valid state of the database, as long as you restore the dbpath as a whole.

Please see MongoDB Backup Methods for instructions and information on supported backup and restore methods.

For further your ref here, here and here