Comment 7 for bug 888428

Well, it would be nice to have; but I suppose there's a got reason for not having nested UDFs. In this case it might be possible to do a workaround, something like removing the folder as a UDF and adding its parent instead. I don't really know if that's possible, or how hard it is, or if it would make a mess with the synchronized files. Let's wait for a developer to take a look at this.

The short term solution is an error message, for sure. A better solution is not to offer the option while it's not implemented.