After the external IDE edits the JS, and saves it, it appears directly in C3 instead of importing it.
What am I supposed to do?
It's not clear what you're doing or what the problem is.
When I use the external IDE to edit the JS, press the Save key how to update the JS, directly in C3 instead of needing to import.
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It's not normally possible to use an external IDE to edit scripts. Are you using the experimental new folder based saves in the browser? Or perhaps the desktop download with a folder-based project?