Hi sewmuchmore
I have tried to replicate this without success - I can get an error message if the attachments are bigger than 8Mb, but that is correct as the system limit is set to 8Mb. The single photo you posted was only 1.7Mb so clearly 4 of those should work!
Would you have time to try again on this thread - if you get the error either screenshot it or write it down for us. It will look like the one in the attachment (but the text might be different)
Thanks, Andy