Agree with Aline's proposal to add a button in ISO line of storage pool tab:


And then pop out a window:


And then show progress. Here we'll have 2 options: progress with percentage indication and only running/finished status.

Option 1:


Option 2:


For option 1, we need back-end support that enables in-time notification of completion percentage when uploading a file with 2 pieces of information: total file size, and received file size.