Hi, @Yohko Ballan
Thank you for posting your question in the Microsoft Q&A forum.
According to your description, you are experiencing the problem of not being able to send mail with attachments in Outlook. You can try the following steps for some troubleshooting:
- Make sure the file type of the attachment you are trying to upload is supported by Outlook. You can try whether this error occurs for all types of attachments or only for a specific attachment?
- You need to verify whether the size of the attachment is within the range allowed by Outlook. If the attachment exceeds a certain size limit, the sending of the email with the attachment can be blocked.
- If you try to send an email with an attachment in OWA, do you receive the same error message.
- Try to delete the app on your device and reinstall the latest version of the program. Sometimes, different program versions can also have an impact.
If you have any questions, please feel free to contact me.
If the answer is helpful, please click "Accept Answer" because it can help other members of the Microsoft Q&A community who are experiencing similar problems and are looking for solutions. Thank you.
Best,
Jeanne