I'm creating a site where users can upload videos. Some video files won't upload: I get the unhelpfully vague error message: "There was a problem with your submission." This consistently happens with some files, but not others. The files that work and the files that don't work all have the same extensions. The problem isn't filesize either: some of the files that work are huge, while some of the files that don't work are tiny.
Any suggestions about what might be going on here?
I really wish Gravity Forms provided better error messages - that could save me a lot of headache.