If Starfish Audio, Starfish Drive or Starfish Groove is unable to play your songs from cloud then one good thing to check is that they are one of the supported formats of Audio.
Alexa Audio Player supports AAC/MP4, MP3, HLS, PLS and M3U audio streams ranging from 16kbps to 384kbps. Other formats such as FLAC/OGG may work, but are not officially recommended.
When testing long-form audio skills on a non-Alexa device, codec support may vary. For instance, audio that may not work on echosim.io might work on an Alexa device, or vice versa. For this reason it’s important to test longform audio skills on Alexa devices.