Failure creating attachment

I am unable to upload attachments. This functionality was working fine till sometime now and now all of a sudden I get this issue. I am trying to attach a 354kb pdf attachment

Are you the owner (Assigned to)?   We have this issue also and have narrowed it down to only the owner can attach, otherwise you get this failure message.  We are still digging into whether this is a Skuid or Salesforce limit.

What browser are you using to get this failure? Is it happening in multiple browsers, or just one?

This happens when I am not the owner of the task.