Need a Cancel Button for audio exports

[LeviXIII]

Current Behaviour

Closing the Export Project tab doesn't cancel the download. It continues downloading in the background with no indication that it is doing so.

Expected Behaviour

• I should see a toast message indicating it is downloading since closing the Export Project window and opening it again will not bring me to the previous completion list.
• I should be able to continue working on things while exporting
• If I choose a large amount of files to download and then want to cancel in the middle, I should be able to click a cancel button and the process should stop downloading from the point that I clicked cancel.