Support » Plugin: Contact Form 7 » File Upload & Validation Conflict

  • I’m having a conflict with validation when I have a file upload field on any form. When I remove this field, validation works perfectly. I’ve switched all other plugins off but this has no effect. I have this issue on several sites with different themes so there is no common ground there either.

    The page I need help with: [log in to see the link]

Viewing 5 replies - 1 through 5 (of 5 total)
  • Plugin Author Takayuki Miyoshi


    Try switching to the default theme and deactivating all other plugins.

    Thanks for getting back to me. In the original post I did mention turning all plugins off and the problem occurring across several domains with various themes, so these do not seem to be the issue.

    However, I have done a fresh install of the latest WordPress on a temp url and only installed the Contact Form 7 plugin using the default theme. This setup should alleviate any possible conflicts.

    I have created a form with only a file upload field on it. Originally I thought it was a validation conflict but it appears not, there is no validation on this form. If the file upload field is left empty the form just hangs on submission, if you attach a file it goes through ok.

    The vanilla test site url is

    • This reply was modified 1 year, 3 months ago by  BlackSheep42.

    Me again. It appears to be a browser based issue. The failure occurs using Safari (v11.1 on macOS 10.12.6). Tried it on Chrome and Firefox on my Mac and Edge on a PC and they all work perfectly.

    • This reply was modified 1 year, 3 months ago by  BlackSheep42.


    I’m also unable to submit the form when using “Choose File” input field on the latest version of Safari.

    I get a “Failed to load resource: the server responded with a status of 400 ()” error in the console on submit and the form does not send.



    You might want to look into this solution:, that was helpful for a similar issue.

Viewing 5 replies - 1 through 5 (of 5 total)
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