File Upload Breaks Form on iPhone, iPad

  • On iPhone/iPad (iOS 11.4.1) I’ve noticed when a form contains a file upload field and a file is not selected for upload (regardless of whether or not the file field is set as required) the form will not submit or provide feedback. The ajax-loader gif simply spins continuously. This is the case on all browsers, Safari, Chrome, Firefox, Opera.

    Here is the error from dev tools console:

    [native code]:1
    POST https://localhost/wp-json/contact-form-7/v1/contact-forms/21/feedback The operation couldn’t be completed. Protocol error
    send @ [native code]:1
    send @ jquery.js?ver=1.12.4:4
    ajax @ jquery.js?ver=1.12.4:4
    submit @ scripts.js?ver=5.0.3:346
    (anonymous function) @ scripts.js?ver=5.0.3:53
    dispatch @ jquery.js?ver=1.12.4:3
    handle @ jquery.js?ver=1.12.4:3

    Any ideas?

    The form works as expected on other devices.

    WP: 4.9.7
    Theme: twentyseventeen 1.6 (issue occurs using other themes as well)
    CF7: 5.0.3
    No other plugins active

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