Actual results:

Aria label attribute is not defined for button in 'Insert image' dialogue.

Narrator is announcing as 'No file chosen, choose file, button'.

Expected results:

Aria label attribute should be defined for button in 'Insert image' dialogue.

User Impact:

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.