You cannot connect directly to Spotify. You would have to copy your songs to the device in MP3 format to listen to them.
Audible has its own DRM format and this MP3 player is not compatible with it. There are very few MP3 players that understand the Audible data format. However, you can install the Audible app on your smartphone and connect it to your Audible account. This will allow you to listen to all the audiobooks in your library.
Alternatively, you can buy the Epubor converter (inexpensive). This allows you to convert your Audible audiobooks to MP3 and download them to your MP3 player.

Only works by downloading the mp3 file to the PC/hard drive and then copying it to the device's memory. Direct access to other icons is not possible!
Ideally, synchronise the device with the PC so that it is always up to date. With 64GB you can listen to music for weeks! Only the battery limits the running time.

no idea .................