With all due respect, attachments and embedded pictures serve two very different needs.
When embedding pictures in-line, it allows for annotations to explain the photos, which is even more important if you're including several photos. As attachments the reader can easily lose the connection between the text and the pictures, plus you can't see the text and attached photos at the same time.
Whether I'm emailing my mother photos of her grandchildren or emailing someone at work pictures of needed PC Board modifications (which visual detail / size is even more important) I almost always need to annotate photos, and that unfortunately means I cannot use Aqua-mail. And that is a shame because I purchased the pro version.
Attached pictures vs. embedded also puts more of a burden on the receiver because he/she has to open each attached picture individually, rather than simply scrolling down while reading their mail.
If I want to send someone really high-resolution pictures (huge files), I'd more than likely put them in dropbox or I suppose maybe attach them, but there are plenty of times I want to embed several 1280x720 or 1920x1080 (or sometimes even a little larger) in-line with text explaining them.
Please fix this. There is no practical reason for limiting the size of embedded pictures. Attached or embedded, the data still needs to be sent, so why make Aqua Mail less useful by creating a false size restriction? No other email app that supports Rich-Text / HTML mail that I've used has such a restriction.
Frankly, this is the only real complaint I have about Aqua Mail. Overall, it's a fantastic app....with this one odd, annoying limitation.
(Okay, so I sort of also wish it supported bulleted lists, but THAT is something I can work around by just typing the list myself. I can't fix tiny, low-res in-line pictures myself.)