To deal with Gmail attachment button not working then check out the steps mentioned below to resolve the issue. To do that, clear browser cache files and cookies and then disable the extensions of your Chrome browser and check whether the attachment button is working properly or not. These are the steps that users need to follow to troubleshoot the issue of Gmail attachment button not working smoothly. It is advisable to follow the steps properly to resolve the attachment button not working in Gmail browser.
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Check, and if required, update your browser to the latest version.
Clear your browser cache and cookies and then test after signing-in.
Disable ALL browser extensions, scripts, and add-ons and start the browser again.
Test using the Gmail Basic HTML Inbox.
Test in Chrome incognito or Guest mode.
Test using another supported, updated browser like Firefox, Edge or Safari.
Temporarily disable your virus checker as Internet security, firewall, and anti-virus applications can prevent Gmail from working correctly - particularly any of its add-ons/extensions that interfere with your access to the web or attempt to check your email. Be sure to turn it back on immediately afterward.
Test in another device.
Using a second Gmail account.
Hope You Find This Useful,
Peter