I use SLM on my iPad. Didn't use it a lot during the lockdown time and with one of the last updates, some hundred of my PDF files have gone lost. I see that they are still "connected" to the songs but they are no longer in the documents database. Does anybody have a similar problem and even better, knows how to handle it (before I start to reload all those files again manually)?
You can copy your attached files back into Set List Maker using any of the methods in step 5 on this page:
http://www.setlistmaker.com/tutorials/attaching_documents.html
I don't know what happened in your case, but it's a good idea to back up your entire device, your Set List Maker databases and your attached files. See the last FAQ on this page for more info:
http://www.setlistmaker.com/support/FAQ.html