Using Mail app with jpg attachments
I have a two-month-old MacBook Pro running El Capitan.
It came with Apple's Mail app.
I need to be able to send original jpg (or jpeg) images as an attachment that can be opened by anyone on any computer, using any mail service.
I have tried everything I can think of, but when sending a 'jpg' image as an attachment, to either 'GMAIL' or a Windows device, the attachment becomes embedded which is useless to me. I need to send an "attachment" just as I might send a data file, or a 'zip' file, or anything else - whatever the attachment is should make no difference.
I can't get this to work.
All the Apple technicians who have taken control of my laptop and tried it on their own have failed.
There are people at Apple who tell me this works fine - but not for me. If the email shows up on GMAIL or another computer, and has the "paperclip" icon, things work properly. If the paperclip icon is not there, I can only save a copy of the image.
As a test, I purchased and installed the "Airmail" app. Works fine. No problem with attachments.
Another option is to send the image as a compressed file. That works.
Another option is to put the image into a folder, and attach the folder. That seems to work.
I can get the image to my iPhone, and mail it from there - no problems.
Can anyone advise what I need to buy, or change, or do, to fix this?
(If there is no answer, what is the best professional email program to buy?)
MacBook Pro (Retina, 13-inch,Early 2015), OS X El Capitan (10.11.6)