Sorry, I have no solution for this problem but at least the list gets bigger.
I've been using iCal 4.x for adding files to my events. I was also able to share those
events ( including attachment ) with my customers.
Today I was looking for an old event + attachment but there was no attachment and not even an information that there might have been any attachment. A link to the file would have been pretty helpful. 😟
Of course, I can find all files but it will take hours, days, weeks to fix everything.
I do not expect any message like " Dear Customer, The world's most advanced desktop OS & online storage service is now available! Oh, btw: you will not be able to add attachments to iCal events anymore using iCloud..."
But an information, somewhere inside iCal, about such issues helps preventing instead of fixing afterwards...
Kind Regards