If you've received an email with an attachment, you may not be able to open it. The most common reasons for this problem include lack of software, file format, and file association. Here are some possible solutions: first, check your system's settings. Make sure you have administrator permissions and have the appropriate software. If you're on a corporate network, you must inform the I.T. administrator of your organisation. If you have trouble opening an attachment in Outlook, you can try installing a freeware program like Mail bird.
See also - https://emailspedia.com/cannot-attach-files-in-outlook-email/
