Clarification of "Path" Option During Upload

[KazuyDarklight]

During the upload step, there is a path option, but its usage is not clearly defined and is not addressed at all in the readme.md

I attempted to use it to upload to the usb storage in my printer that is recognized as sda1. Since it sits at the top of the job storage space I tried
sda1
/sda1
/sda1/
./sda1/
./sda1

etc, many of these seem to get simplified down and everything so far has resulted in an Internal Server Error except for mnt/sda1 which gets Gateway Time-Out

So far the only thing that has worked is leaving this blank and letting it just upload to the system's built-in storage instead. I'd love some guidance/examples in the readme to help clarify the proper usage.

[KazuyDarklight]

After some further experimenting, I think I may be experiencing a bug similar or the same as is covered here: #96, but it only errors when I try to save outside of the root directory. It doesn't matter if its internal storage or the usb, anything other than the root directory generators errors, though sometimes the file still does get uploaded.