Cache and downloads on external storage

[DanteTechnique]

Problem

Hello, after a huge and cool update and UI improvement, can you bring back the feature that allows you to keep downloaded music on external storage? It's very important for me and I think most people

[ghenry22]

I'll look into enabling it, but Google seem to do their best to make it an absolute pain to access external storage in modern android versions. I did have this baked into the old version of substreamer but it was a bit of a support nightmare across different vendors / android versions and library publishers who never provided support and ignored PR's to add it when I tried to contribute.