First, check the settings of the application that you use to access your Gmail account. If they are set to "Advanced" in the General tab, you can switch to the Basic attachment uploader. Next, try uploading attachments to another computer. This might be the problem. If this does not solve the problem, you may need to clear browsing data and cache on the first computer and then switch back to the advanced attachment features on your second computer.
For more help - https://onlinegeeks.net/fix-gmail-attachment-issues/
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