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Upload failed. There was a problem signing the asset, so. I canoot upload some images

Trying our Webflow. First I wanted to add a background image. So I tried to upload a photo (smaller than 4MB)
Got following: Upload failed. There was a problem signing the asset.

Some other images do upload, other images do not upload.

I read more simular topics, but no solutions in the answers.

Not a good first impression.

Who can help?