Allow uploading multiple files at once in the web IDE
Problem to solve
Uploading multiple files at once, similar to #13284 (moved) but for the web IDE.
Further details
- Quick asset replacement for people without extensive git knowledge would be possible.
- Basically all IDEs support adding multiple files.
Proposal
What does success look like, and how can we measure that?
The UI could be similar to #13284 (moved). Directly dropping files into the IDE would also be nice (Is there a separate issue for that?).