I just did a fresh install of Picard on Windows 10.  I set up "Move files when saving", with the destination directory "\\synology\music", with a nearly-stock renaming script (which I've been using on my Macbook just fine):

```

$if($eq(%compilation%,1),Compilations,$if2(%albumartist%,%artist%,Unknown Artist))/

$if(%album%,%album%/,)

$if($gt(%totaldiscs%,1),%discnumber%-,)$if($and(%albumartist%,%tracknumber%),$num(%tracknumber%,2) ,)$if(%_multiartist%,%artist% - ,)%title%
```

If I drag and drop an album into Picard (one that's already got all the correct metadata) from, say, \\synology\music\Artist\Album, then I try to save those tracks, it will move all the files in the album to \\synology\music\Artist\Album\Artist\Album.  If I save it again, it will move it to \\synology\music\Artist\Album\Artist\Album\Artist\Album, etc...

If anyone else runs into this, as a workaround you can go to you server in the Windows File Explorer, right click on the share an pick "Map Network Drive..." to assign a drive letter to the network share (e.g. I assigned "X:" to \\synology\music") and then you can use this as your target directory in File Renaming and it will work correctly.