hi Tails, I just checked the submission list, & there is nothing there, so I'm afraid the upload failed.
Like MADMAN says, a double upload is no problem, since we can always easily spot it's a duplicate and simply delete it (happens with SOTDs too, occasionally). Although, since you usually include a lot of preview screenshots with your mods, I can imagine that you don't want to have to upload a whole bunch of files twice everytime, just to be sure.
(Feel free to contact me via Private Message too, if you're having a problem or are wondering about the state of one of your uploads. It may take some hours before I can respond though, since I don't have internet access at work)
I've no concrete idea about the cause of your crashes, if it's your whole system that crashes and restarts, maybe a tool like
Speccy may help you monitor if one of your components is running too hot, or running out of memory, for example.
If these crashes only happen when you're uploading here, then I'm afraid I can't think of a connection. If it was just your browser crashing, I could imagine it having to do with a file being too big or uploading too many items at once, although I don't have the tech insight to back this up, it's just a hunch. Hope you'll be able to figure it out and don't hesitate to ask for help.