A better option would to be discontinuing using Microsoft Edge and using either Mozilla Firefox or Google Chrome, as one or both of your Internet browsers instead.
You can download Google Chrome here:
http://chrome.google.con
You can download Mozilla Firefox here:
http://www.mozilla.com/Firefox
After you've downloaded both Firefox and/or Chrome, use both of them to do the "OWA" task that you mentioned in your original post and see which Internet browser actually allows you to "attach" pictures, videos, etc. to your e-mail messages.
If neither one of those Internet browsers work, and if the option of the second poster of this thread suggested doesn't work, you can go to your local public library, and use OWA there and see if it works on [any] of the computers there.
(NOTE: Every public library's hours are different, so make sure that the local public library nearest you is open when you want to go there to your OWA thing.)
**** I don't know what OWA is nor have I heard of it, so I hope that all of the suggestions that I have given you within this message helps resolve your issue!
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**** Have a great day/afternoon/night!
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**** pinellas2016 ****