The Album feature has been disabled for 3.x. It will come back in 4.x (x > 0!).
The Album Manager allows you to prepare a list of multiple scores and save the list as an album file ("*.album"), print all the scores as one long print job with consistent page numbers, or even join the scores into a single new MSCZ score. This is ideal for preparing an exercise book or combining multiple movements of an orchestration.
To open the Album Manager, go to File → Album...
If you have previously created an album, you can open it through the Album Manager by clicking the Load button. A file selection dialog will appear to let you load the .album file from your file system.
To print an album as if it were a single document, click Print Album. The scores loaded into the Album Manager are printed in the order they are listed in with the correct page numbers, ignoring the page number offset values in Layout → Page Settings... → First page number for all but the first score. As the album is printed in one print job, double-sided printing (duplex printing) also works as expected.
To combine multiple scores into a single .mscz file, click Join Scores. The scores are combined in the selected order into one single score. If not already present, line- and section breaks are added to the last measure or frame of each score in the combined file.
All style settings are taken from the first score, different style settings from subsequent score are ignored.
All the scores should have the same number of parts and staves for this to work correctly, ideally with the same instruments in the same order. If the scores have the same total number of instruments but not the same ones, or not in the same order, then the instrument names from the first score will overwrite ones from subsequent scores. If some of the scores have fewer instruments than the first score, then empty staves will be created for those sections. Any part or staff that is not present in the first score will be lost in the joined score.
Upon clicking the Close button, you will be prompted to save your album as a .album file. This file is not the same as a joined score; it simply consists of the list of scores. Album files can be loaded into the Album Manager as described above.