Cypress.io Tests on k-upload in Panel

The CMS Questions
1

i’d like to run some tests on the Backend with cypress.
Now i run into the problem that i’d like to test a file field upload and don’t know how to solve this.
A search here in the forum gives only one cypress result.

i’ve installed the upload plugin GitHub - abramenal/cypress-file-upload: File upload testing made easy for cypress and with the following code a file gets uploaded but not shown in the backend or reconized after saving the page.

        cy.get('input[type="file"]')
            .as('fileInput')
            .attachFile('teaser.jpg')

anyone here got an idea or solution?