Email (Photo) Signature

Yes, you can add a photo to a signature like this one:

which looks like this in the email:

I created the signature in an email and then did a select and copy and pasted it into the Signature section of Mail's settings. I didn't try to create it in the settings pane.

Only on Mac, it can’t be done on the phone or on the iPad.

It absolutely baffles me that Apple has not done more to streamline third party email accounts between devices and improve the functionality of their signature capability. Outlook has the ability to add a picture as an email signature both on Mac, iPad and iPhone. You would think apple could enable this with the click of a button.

Additionally, I should be able to add an email account on one device and have it reflected (with all the email settings) on all apple devices where I am signed into the same iCloud account.

Where is the author's original post is iPhone or iPad mentioned. I see the suggested articles under his post but he didn't indicate what device he was inquiring about. You're probably right though.