Export/Import playlist - what have I done wrong?

[dontfollowme]

Hi,

This morning I exported my playlists as I was swapping out my boot drive for a new one. I have come to import my playlists and each one only contains ten tracks which I think is probably the last album I played in MB before changing the drive over.

I have opened up the playlist in Notepad ++ but it still shows the same ten tracks.

What have I done wrong?

I do have the option of plugging in the old boot drive and re exporting the playlists if this is the step I got wrong.

Any ideas?

Thank you

Update:

So I have located the old playlists and this is a sample:
F:\Music\Sparklehorse-Dreamt_For_Light_Years_In_The_Belly_Of_A_Mountain-(Advance)-2006-uF\03-sparklehorse-shade_and_honey.mp3ÿÿÿÿN

From within MB it will not let me import this playlist. So that is my next line of investigation. Do I need to convert it to m3u?

Update 2: now sorted.

[dontfollowme]

So wasn't too bad to fix in the end. Things I learnt:

The export playlist function didn't work as I expected it
The playlist files are stored under windows music library under a music bee folder rather than under the music bee install folder (this is the default - expect you can change it)
Use the relink function to point MB to the new location if the drive letter has changed: https://musicbee.fandom.com/wiki/Relink_Music_File_Paths - You need to state the full file path rather than just the drive where the music folder was/is now located
When you open a playlist file in notepad it looks strange as per my post above. This is fine, that's what they look like.

[dontfollowme]

One issue left to solve. The imported playlist has removed the tags from a lot of the tracks:

https://imgur.com/a/Jg54E6L

[dontfollowme]

Does anyone know how to fix this?

Edit: Realise I'm talking to myself but this was resolved by making sure the box was ticked for scan for new or updated files at startup under preferences > library