GMail incoming picture bundling

Hi

I send some security camera pictures to GMail and would like them bundled automatically in the inbox.

Makes it easier to browse the image thumbnails.

I would like to use GMail SMTP to upload the images but they become stored as individual emails.

Using GMail SMTP is more portable if I move ISPs.

Here are a couple of examples:

Using my ISPs SMTP the GMail layout is this and is done automatically with up to 100 images side by side:

Using GMail SMTP this is what I get - each image are stored as individual emails:

Anyone know how to automatically bundle images in the inbox using GMail SMTP for upload?

I know there are GMail guides for bundling to labels but that does not work as well as using my ISPs SMTP.

TIA