For the Method Manager 2, the groups, links, and settings are stored in JSON files that are kept in the db folder:
So, you could modify the links file directly with new file paths for your methods and then copy the JSON file over to other setups. You can copy all the files if you make changes to the groups, settings, etc.
For the Attachments, you can select just about any file type: pdf, ppt, etc.
The file will them be selectable via the Attachment icon for the method and will launch that file.
You could have links to a manual, procedure, deck loading instructions, etc. that might be helpful for the user.