compositeuploadjob: Set total and processed files
This is the proper way to communicate progress. It has Plasma show the file name in case of single files and "n of m files" as before for multiple files.
Sent a single file: "Sending to Phone: filename"
Sent multiple files: "Sending to Phone: 1 of 3 files". Verified that when transfer was done it sat at "3 of 3 files"
Matches what the receivejob is doing, too.