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.
Came here just because of this, will have to revert back to Chrome on mobile which is really sad. Changing the location in about:config does nothing, and my phone can't manage the main Downloads folder, rendering it useless as firefox won't allow me to change the location.
This has been an issue since 2014...almost 10 years. No wonder firefox sees less and less users