How does your site receive images? As far as I know, files can only be uploaded to input elements with type="file".

@fran0254 can you post a larger code snippet with the url you're testing against. We need more info to be helpful!

You should be selecting the file input with page.$ instead of the button that activates the upload. If you're not using a input type=file on the page, is the button using xhr.send(blob) to send the file? In that case, it wouldn't be appropriate to use .uploadFile().

how can you check does not exist input type="file".
Is there a possibility to upload my files using css selectors?

code of site:

<div class="insertadonCol">
    <div class="photoUploaderWrapper">
        <div id="dropArea">
            <form action="/images/upload-image-tmp.php"
                  method="post" class="dropzone" drop-zone="" id="photoUploader"
                  enctype="multipart/form-data"></form>
        </div>
    </div>
</div>

Code of site DOM

I don't see an input type="file" in your markup or code that handles a file upload in your example. But in theory, you could use puppeteer to "drop" a file onto the form and then use page.evaluate to call form.submit() or do something like https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#class-elementhandle.

Should I use coordinates to drop the file in the box? Can you please put a small example? I do not know how I could do it ...

We currently don't have support for drop targets. Filed it as #1376

Closing in favor of #1376.