"Upload Success" message does not come up when changes are saved. Intermittent

One user is finding that intermittently when she saves a file that she is editing, the confirmation message "Upload Success … " does not appear. When she checks the file by closing and reopening it in SeaFile sometime her changes were saved and some times they were not. I have not to been able to replicate on my computer but I have observed and seen it happen to her.

Our environment is Windows 10 Seafile Client v7.09 and Linux Seafile Pro Server v7.0.13

Any ideas, anyone?