So, I've been trying to achieve auto-propagation (pre-translate) from Deepl on opening a new file - single file, not a project, if that matters.

For that purpose, when opening the file, I go to Advanced -> Batch Processing -> Pre-Translate Settings -> and I check "When no match found: Apply automated translation" at the bottom. 

That doesn't do the trick though, because the file still opens empty, and then I have to save it and apply pre-translation manually. Only then does it work.

How can I do that automatically on file opening?

I'm using the "default" Project Template.