Cypress + Laravel - file upload testing works with a PNG but not with an MP4 file

[Jamesking56]

Hi hoping I can get some help here.

I'm using Cypress 10 with Laravel 9 + InertiaJS.

I have a hidden <input type="file" name="some-name"> and when a file is selected, it is immediately sent using Axios to a Laravel route where the file is saved to storage. This form works for the necessary file types (images and videos) when I manually test but I'm having issues getting Cypress to upload files properly.

My test does what the documentation says and uploads a file as follows:

cy.get('input[name="workoutFile"]').selectFile('storage/app/example/day1-exercise1.mp4', {force: true});

Laravel successfully sees a valid UploadedFile for a .png file but for any .mp4 video, Laravel gets an invalid UploadedFile with no size, no conent and the wrong path.

Any ideas why mp4s don't seem to work but pngs do? Is it a bug in Cypress or something extra I need to do for mp4 files?

Cheers.