Combine features from preload savefile and sync

[DivineMK]

Requested Feature

When using spotdl sync, the generated save file doesn't have the youtube links used for each songs like when using preload. I noticed that the only difference between sync file from sync and download only differs a bit (with sync, there is a link to the Spotify playlist that is synced).
The reason behind this request is I often find the download url linking to different versions of the songs that I wanted.

Possible implementation

No response