Aria label attribute is not defined for button in 'Insert image' dialogue.
Narrator is announcing as 'No file chosen, choose file, button'.
Aria label attribute should be defined for button in 'Insert image' dialogue.
Adding effective form labels is absolutely necessary to make forms accessible. The purpose of form elements such as a checkboxes, radio buttons, input fields, etc. is often clear for sighted users, even if the form element is not programmatically labeled. This isn't usually the case for screen reader users. Adding a label to all form elements eliminates ambiguity and contributes to a more accessible product.