Why do my Local files appear on another device, but won't download?

[lyt1x]

I can't download my Local files on my phone, but they appear on my phone. I tried to do this:

• Check you're logged in to the same account on both your desktop and mobile.
• Check your devices are connected to the same WiFi network.
• You must have the latest version of the Spotify app installed on both devices.
• Check your device's firmware is up-to-date.  

that didn't help me at all
tried to do also this:

• Are you on the same WiFi as your desktop device
• Do you have enough storage space on your mobile and desktop devices?
• Are you over the 10,000 limit on your mobile or the 50,000 global limit of local songs?
• Have you tried re-downloading the entire list, but see that the same songs stay grayed out?
• Have you checked if the song’s already on Spotify?
• Have you re-installed Spotify on both devices and re-downloaded everything?
• Are other media players playing the track just fine?
• Is the file a supported file format, like mp3?

didn't help me again, so I found also this and tried to do it:

• Re-download the song, but add it to a sub-folder of your "Downloads" folder.
• Try downloading (or moving the file you already had) to a sub-folder, or different folder altogether.
• Add that folder as a source for your Local Files.

And that also didn't help. How can i fix this problem? I tried almost everything

[AeroZ]

Likely wifi router configuration issue.