Upload field not working on MacOS browsers

Hi,

I created a registration form using this plugin. I have upload fields as being required, which all works fine on windows browsers, but for some reason on MacOS browsers it doesn’t. When uploading a file using safari for example, the file keeps uploading showing the green bar, but nothing else happens. Upon submitting the form, keeps showing error and saying that those fields are mandatory, although the image is there, but clearly not finished uploading.
Has anyone else had this issues?

Regards,
Marisa