When you open an agenda, VideoPsalm searches for the songs in the agenda among those in its songbooks.
To do this, it uses the song identifiers.
VideoPsalm does not rely on song titles.
In this way, even if you modify or correct the title of a song, VideoPsalm will match the songs in the agenda with those in its songbooks.
The same mechanism is used for songbooks and Bibles.
Don't worry about identifiers, unless perhaps you're using Notepad to externally edit your songs.
pCloud, DropBox, OneDrive, Google Drive
If you use a Cloud service to synchronize your songs between multiple PCs, you may experience a synchronization conflict. When this happens, a songbook may be duplicated, resulting in duplicate identifiers. You will need to select one of the duplicate songbooks and delete it.
Additional information
Protect your songs against changes propagated from agendas