I think that what's happening in this case is that you're not specifying the path you really want.
`/test1234567` is an absolute path. Most probably, you don't want to create a directory in the root of your filesystem.
Perhaps you meant `test1234567` (no leading slash), to put the directory in your home directory?
For the most part, the way Globus treats paths is "pretty normal", so anything you learn or know about "absolute path vs relative path" is relevant. But maybe skip reading the wikipedia page on file paths -- it's full of exotic trivia!
The only special case is `/~/`, which is treated specially as meaning the endpoint's default directory. Out of the box, the default directory is your home directory, but it is configurable.
I hope that either you worked things out already or that this helps get you unblocked!
Best,
-Stephen