You may want to watch this YouTube video - it shows the scenario that I believe you're looking to solve - it uses Preview to create a multi-page PDF.
The steps are:
- Open your images in Preview
- Select
Print
from theFile
menu (or ⌘P) - Click on the "
PDF
" button in the Print dialog and select "Save as PDF...
" from the dropdown - Provide a file name and
Save