Sign a transaction file

Hi everyone,
how can I sign a multisignature transaction with a function in javascript? I want to sign the transaction and send it to the network. Is possible in javascript to open the .txn file and sign it?

Thank you :slight_smile:

We are in the process of reworking this but it can be currently done using samples here:
https://developer.algorand.org/docs/features/transactions/offline_transactions/

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