Email users often face problems while attaching files or documents. They often complain about the Gmail attachment button not working. If such is the case, you can try the following fixes: Disable all the extensions linked to your browser. Open your Gmail account from a different browser and try to attach again. You should always use the most recent version on of the browser to access your account. Uninstall the antivirus programs and firewalls temporarily. You should disable the proxy server settings from the LAN tab. Gmail uses Flash for default attachments. So you should always use the updated version of Flash.
If none of the above-mentioned problems solve the attachment issue, you can take assistance from technical experts.