All albums have vanished from the spotify app.

[Contra]

A couple of days ago all my saved albums and songs I had downloaded vanished in the spotify app.

The albums are still available in Windows though.

Is there anyway to resinq the mobile app with the albums I saved in the windows version?

I don't care if I have to download the individial songs again, but not having my album list there really annoys me.

[Daniel]

That's odd. Can you try logging out and back in again? Last resort would be a clean install:

NOTE: You will lose all preferences & offline playlists in doing this!

Uninstall the app from Settings - Apps then scroll to the Spotify app and tap on it, then press 'Uninstall' (or any other way you usually uninstall apps).

Once done using a file manager (such as ES File Explorer) make sure that the below folders are deleted (the second one may be still remaining from the older version of Spotify):

/Android/data/com.spotify.music
/Android/data/com.spotify.mobile.android.ui

Note: - Make sure to check both Emulated/0/ AND the /ext_sd/ locations for these folders as they could be on Internal memory or/and external SD card.

When all folders are removed go to the play store and install the Spotify Music app again (Direct Link).

Official guides for a clean reinstallation here
If using an external sd card to store your cache (Offline Playlists) on Android 4.4.2+ then please read instructions in the thread here: [Android 4.4.2+]Cache on external SD card is possible

[Contra]

What is also strange is that a new album I added in windows has appeared on my android device, but the rest hasn't.

I logged in and out and it didn't help.

I will follow your advice and reinstall the app, I will reply here with my findings.