Hi Andrej. If you are not able to send emails with attachments, we recommend you take a look at this article: goo.gle/2HhdQKD. Also, We suggest that you take a look at this article to troubleshoot: goo.gle/33KpuHG. You can also try uninstalling and then reinstalling the Gmail app. If this doesn't help, please visit our Community Forum for any additional assistance: goo.gle/3586PHb. Thanks.