Hi,
Thanks for the report.
When an upload failed with the ajax uploader, the item you tried to upload show stay listed with a red background.
In the original design, the error message where displayed in this block but the actual implementation does not return a serialized error message to let the javascript display it.
I created a feature request for the ajax upload so we will improve that part.
We started to work on a "chucked" feature for the uploader, so when a file is bigger than your maximum upload size, the uploader will chuck it into several pieces, send these pieces one by one and let the server recreate the entire file.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.