Not exactly an app fix, but if you are on your desktop in Windows 10...
Find the picture in File Explorer,
Right Click it,
Go the 'Send to'
The options their should show you 'mail recipient'
On my computer, the mail client is Office (current version) 2016
On my computer, when I click that, it gives you the change to change the file size (handy),
and then send the picture as an attachment.