Thanks for the correction, Steven. I’m very happy that I was wrong on this topic; this apparent “file limitation” had really bothered me.
Frankly I was confused by the terminology; “Add File” just didn’t register. I’m more familiar with “Load”, and for that matter, “Save” - which usually refers to “file it elsewhere” (either to my computer or to the cloud), not remaining within the “project” (another new, and here essential, term).
As found in Audacity, I would rather prefer the terms “Import” and “Export” to be used in the IDE, and I’d particularly like a separate “Export .csd” option, along the lines, recently discussed, of a simpler “IDE Light”. As it is, I feel neophytes (and perhaps old-mode Csounders like me), can be overwhelmed by the IDE, and find ourselves looking for more basic Web-based alternatives.