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You can also turn off the proxy server in your web browser. If you're unable to attach files to your Gmail, you can turn it off in your browser. After you've done this, open your Gmail account and check if you're able to attach files. You should be able to attach a file now. You'll need to make sure that you're using the correct web browser for your device.



Read more - https://getposttop.com/gmail-attachment-issues-and-solutions-to-fix-them