How to make the specified music and multiple photos synchronal?
1. Adjust the durations of multiple photos to suit the length of music
Drag the right end of each photo's thumbnail to increase their durations until the total duration is identical with the length of specified music.
2. Trim the length of music to be consistent with multiple photos
Calculate the total duration of multiple photos approximately. Then double click the rectangular bar representing music to bring up the Edit Music dialog box, in which trimmed the music to the length same with duration of photos. Click OK to return to Timeline view, adjust the length of music to be exactly the same with the multiple photos by dragging the right end of the rectangular bar representing the trimmed music.