Upload button missing label

Is it an issue related to Adaptive Cards?

No.

What is the PWD impact?

What It Means
A form control does not have a corresponding label.
Why It Matters
If a form control does not have a properly associated text label, the function or purpose of that form control may not be presented to screen reader users. Form labels also provide visible descriptions and larger clickable targets for form controls.

What browsers and screen readers do this issue affect?

Others

Are there any code-based customization done to Web Chat?

Yes, however, this also repro when customizations are not in use.

What version of Web Chat are you using?

Latest production

Which area does this issue affect?

Others or unrelated

What is the public URL for the website?

No response

How to reproduce the issue?

Inspect web chat client with hideUploadButton: false using WAVE tool

Tool reports missing label from

What do you expect?

Input to have label to meet standards

What actually happened?

Input missing label

Do you have any screenshots or recordings to repro the issue?

No response

Did you find any DOM elements that might have caused the issue?

MAS reference

No response

WCAG reference

No response

WAI-ARIA reference

No response

Adaptive Card JSON

No response

Additional context

No response

Start by inspecting the upload control identified as .webchat__upload-button--file-input while hideUploadButton is false, and reproduce the report with the WAVE tool. The work is done when the control has an appropriate associated label and WAVE no longer reports the missing-label issue.