Sticking is deleted upon saving and re-opening a file
1) Make a score and place a note
2) Input sticking for that note
3) Save the project
4) Close the project
5) Re-open the file
You will notice all sticking you wrote in has disappeared.
I can't think of any workaround for this because it essentially makes the sticking feature useless if it's going to be deleted upon file closing.
Uploading a score would be pointless to as it wouldn't show any sticking.