Why can I not upload videos to the form I created

The file type of the video you are trying to upload is not supported. However, you can add the file type to the allowed list, please check this guide: https://www.jotform.com/help/29-How-to-Change-the-Allowed-File-Types-in-the-Upload-Field 

Tried that but it does not work can you not add the files that are used by iPads and I phones
as it must be easier for you to do it S it's your software
...

Please remove all the listed file types, and just leave an asterisk to allow all types of files:

Let us know if the problem continues.

I tried that
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Can you please try removing the Upload fields on your form. And then just replaced them by adding a new Upload field.

 

If your video file type is not yet included in the existing extension names, you can add it manually to the Upload field option. 

Example: 

Make sure the new extension file type is separated by comma sign.

Let us know if this still did not resolve the issue.