With Cypress, you can easily create tests for your modern web applications, debug them visually, and automatically run them in your continuous integration builds.

Cypress Community

Here is a high-level example of how you can accomplish this using `append` and  `cy.fixture` if you place your test file in the fixtures folder.

``` const createUpload = () => {
    cy.fixture('attachments/myFile.pdf', 'binary')
        .then((file) => Cypress.Blob.binaryStringToBlob(file))
        .then((blob) => {
            const fileData = new FormData()

            fileData.append('file', blob, 'File Name ')
            fileData.append('user_insert_id', 'cypress.test')
            // whatever other values are needed

            return cy.request({
                method: 'POST',
                url: 'Your URL',
                body: fileData,
                headers: {
                    'Content-Type': 'multipart/form-data',
                },
            })
        })
}