I'd love to see upload to SD-Card feature as well.
Why? I guess I could say: "just because OctoPi has it", but the real reason is: I don't trust printing over USB all that much. For one of my printers USB printing is officially not even supported. I did have a few prints fail over USB when using Cura (it just stopped mid print) and that caused me to go SD-Card only back then.
So I started looking for a solution just to upload files to my SD-card (wifi-sd only works in one of my 2 printers) and there's nothing out there. That is why I decided to give Repetier Server and OctoPi a try anyway and so far, USB printing worked just fine in Repetier Server (I did have to use a short USB cable though to avoid strange com errors) but there's still this nagging thought when starting a long print: "should I play it safe and print from the sd-card instead?".
Being able to upload to the card (drag&drop would be nice), organize files on the card (delete, rename) and move files back and forth from Reptier to the card and vice versa would be a welcome addition for a new version of Repetier Server.
PS: i'd also love to see a notes field for each gcode file in Repetier Server, so I can attach some additional info to each file.
PS2: It would be really nice if i could setup a Samba share to "upload" to Repetier Server instead of having to go through the Webbrowser
Sorry for hijacking this thread :-)