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It very much resembles Dasysyrphus tricinctus in Rotheray's key to the larvae, but it may well be another species of that genus.

And as to multiple images in a message: If you have some space on a web server you can put the images there and then embed links to the images in your message. Attaching an image to the message so that it is uploaded to the Diptera.info server allows only one image per message (security to prevent the bad folks from easily clogging someone else's webspace).

I usually transfer attached images to another server after some time and use the embedded link. This will allow us all to continue using the website withoput to much danger of completely filled webspace.

Paul