...
If you only need to update the content of the corpora in an engine but you are using the same files, you don’t need to edit the engine at all. Just update all the changed corpora (or re-import them from their CAT tool of origin), and when you come back to the engine, you will see indicators in the list of corpora:
...
The Update available Corpus updated indicator means that a corpus has a newer version available, but the engine needs to be re-trained to reflect the changes.
...