Contact form 7 Version 3.7.
I have 2 copies of a form, 1 never had HTML option checked the other has.
The html one wont submit if a file is attach, the other has no trouble. Even is I remove the html option it wont submit.
if I leave the file uploads empty all is fine.
the file is uploaded and deleted. (i can see it with filezilla)
i tried switching back to 2014 default theme. nothing change.
i get the "Failed to send your message. Please try later or contact the administrator by another method." (not the spam one, i changed to text to make shure)