Is it possible to retrain/train a model that is loaded through snapshot (.ingp file)?

[Fr7n]

Hi, i was trying to train a model with a plate and some food.
I'm still trying to understand what the multiple parameters do but i was wondering if it is possible to retrain/train a model that was saved and trained before.
Basically, open instant-ngp.exe, and loading this model through snapshot.
I'm able to load the model as expected and i can mess with every section apart from the training section.
Is there a way to retrain it? If not from the .ingp file, what extention do i need to use?