Hi Elena6, are you referring to the attachments beside the memo, or have you already uploaded a file that is not appearing in the attachments section?
Please ensure your attachments do not exceed 20MB. If your file is within the limit but fails to upload, I recommend accessing your account in incognito mode to check if this is a temporary browser problem.
If the issue resolves after this process, please ensure your browser is up to date. You can also use other supported browsers.
Don't hesitate to reply here if you require further assistance.