Be able to choose where to save downloaded music

[KakarottoCake]

Checklist

• [X] I've checked that there is no other issue about this feature request.
• [X] This issue contains only one feature request.
• [X] The title of this issue accurately describes the feature request.

Feature description

Instead of downloading the music to an arbitrary folder inaccessible to the user, be able to send the files to a specified folder (by the user), and allow it to be configurable by the user.

Why do you want this feature?

I would like this feature because of an ease of managing my music for when I go on business trips.

Additional information

No response

[z-huang]

I'll do #117. If this solves your needs, you can close this issue.

[z-huang]

Close for being idle.

[matrix-9013-jmk]

I might be missing something about how Android's SAF works, but i don't see how #117 meets this use case, or the one described in #238. I'm able to find the downloaded files through a file manager, but not through any other app, especially ones that look in Music to discover local songs.

Just finding them in a file manager app isn't sufficient; I'd like to find them in (for example) VLC, Kodi, the stock Music app, etc. To my knowledge, those other apps are not able to open this storage location.

(Thank you for an excellent app!)

[z-huang]

SAF is used to export files, so you need to copy them out to let other apps find them.