How many files can I attach to a page?
You can attach as many as you want, but you have to do them one at a time. So, you can create a page with a file attachment as you usually do and go to edit the page again. At this point you can choose another file to attach and just save it again. Repeat this process as required.
One caution - the current site template is not really setup to handle more than one image per page. It will work, it just looks a little strange. I am going to move this up to the top of my to-do list for the next version.
The current site template now supports multiple images per page. If you do not like having multiple images per page but would like to group images around a common theme you can create a folder for the theme and a separate pages in that folder.