Hello,

I'm trying to upload a pdf via media manager. I get the error: "Not a valid image."

1. I did add pdf to the list "Legal Image Extensions" in config/system/media manager.
2. I also tried adding pdf to Ignored Extensions, just in case this would do the trick.
3. If I set Restrict Uploads to NO... I can upload the pdf (but I don't want to do this).

What's the problem?
Thanks,