How can I reduce size of photo attachments in the new Outlook with no option to choose small, med, or large?

I used to be able to click on insert attachment and go to my photos and choose the JPG image to attach and then I could choose whether the size of the attachment would me small, medium, large, or original. Now this option no longer exists, and every photo I attach to an email automatically gets attached in the original very large size. The recipient then has to downolad each image separately, as they are too large to view as slide show.

There must be a way for me to choose to make attachment smaller.