spaCy 3 nightly: How to further train an existing model

Sorry Ines, forgot to ask:

When I converted my previous train-data to the new spaCy binary format, I received the following warning:

UserWarning: [W027] Found a large training file of nnnnnnn bytes.
Note that it may be more efficient to split your training data into multiple smaller JSON files instead.

If I split the JSON into several files, can I still convert the JSON files into a single spacy format file? If yes, how would I do that?

And if I can't, can I specify more than one train file on the command line?

Or would I use your instructions from your above post and do several consecutive trainings?