Hello! Watch has 7 gb free space, but in Alpacast music app on synchronization I got message "No more space left on device! Delete some episodes from the playlist and try again." when free space on devise less then alpacast used storage, like on attached screen. If free space more then alpacast used the sync has no error, for example 8200mb/9000mb.
Developer of Alpacast answer me: Sorry, I don't think there is much I can do to help you. All the storage handling is on the garmin side of things. That error is only printed when the download request to the Garmin api responds with Communications.STORAGE_FULL.