The instructions apply to Gmail.com in any web web client.
From your Gmail inbox screen, select theSupporticon (question mark).
SelectSend Feedback to Google.

pop in your feedback into the box.
To include an optional screenshot, check theInclude screenshotbox.
The web app window containing Gmail is automatically captured.

Optionally, pick the overlay text on the screenshot that saysClick to highlight or hide info.
Use the yellow and black boxes to mark up the screenshot.
The tools draw rectangles of any size you wish.

ClickDonewhen you’re finished with the tool.
FAQ
If you’remissing emails in Gmail, check your All mail, Spam, and Trash folders.
Also, check for blocked and forwarded addresses.

IfGmail isn’t syncing, perform a manual sync and enable automated sync.
If you still have issues, review your machine activity and enable IMAP.

