Demo stalls at download

[Iborroworrobi]

Describe the bug
A clear and concise description of what the bug is.
Demo loads file, produces midi and plays file with graphic. When user presses download nothing happens

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://basicpitch.spotify.com
2. Drag and drop wav file into the labelled rectangle

file appears to load
App says processing or similar
User can play file. Sounds accurate
Press download and nothing happens
Double click download and nothing happens

Expected behavior
A clear and concise description of what you expected to happen.
Expect to be asked where to download file to

Used ipad10 with Brave browser