I'm an Android user so I'm not sure what the situation is for IOS but, on Android at least, you can't change download location. This is really annoying as I have to constantly move files after downloading. Please fix this.
On Android, there is no option in the settings to change the download directory. I tried changing the about:config like mentioned for example here, but it does not work for me (I want to save the downloads to my SD-card). I also think it should be intuitive and implemented in the UI because it should be a common and important feature.
Moreover, I think it would be great to be able to change a setting so you are asked where you want your file to be stored to.