Change File Name

How do you change the file name in Notion? i.e., I uploaded a musicXML, did some stuff to it, and then had to delete. I re-uploaded it to try again, and now there is a -1 in the file name. Not a huge deal, but would be nice to be able to change that.
Also, the only way I have been able to upload musicXML is via DropBox. If I transfer via iTunes, it doesn's show up.
Also, the only way I have been able to upload musicXML is via DropBox. If I transfer via iTunes, it doesn's show up.