Original User: sgill
Hi Laura - Mike is away at the moment, but I will see if I can help.
I had a look at your clientaccesspolicy.xml file, and noticed that the XML declaration that's normally the first line of the file is missing. This should look like:
<?xml version="1.0" encoding="utf-8" ?>
I dont know if this will have anything to do with the problem, but I think it might be worth correcting anyway.
I tried adding attachments to your service, and noticed that smaller files work. I attached a jpeg of under 4KB to the top-left feature successfully (5692 Bellaire Drive in case you want to delete this again), but when I tried to add the same photo resized so that the file size was 15KB, this failed. The error message I could see in Fiddler was fairly generic, error code 400, Unable to complete operation, Unable to add attachment for feature 130 in table 0. I dont know if there can be some kind of size limit imposed from the server side - perhaps it's worth finding out if the admin of the feature service if there is any known limit there. If you have ArcMap, maybe try adding from there too, in case this limit is purely from the web service side of things - I tried in the ArcGIS.com viewer to add the same files as attachments, and got the same failures as in Explorer Online.