Error, "Disallowed file type."

Hi everybody, it's the first time that i trying to upload a pdf file and I see this message. In "configuration" it's allowed the pdf. I had upgraded the version of modx to 1.08 but nothing change. I dont see the files in the files folder with TinyMCE, I see it only with the ftp. I tryed to cancel every pdf, but nothing change....

Thanks in advance

Check:
Tools => Configuration => File Manager =>
In the list on the left side look for
Uploadable File Types and on the right side in the bar
look for pdf as allowed file type. If not there add it to the list.

Empty the cache of Evo and reload the page a couple of times.
Sometimes the server doesn't keep up with the changes.

More here:
https://forums.modx.com/thread/77854/uploading-allowed-file-types-not-allowed

Check settings on the server of your host