Hello,
I'm new to this and I started my project on the web editor. But then I realized some of the features I need are only available in the download version.
So I downloaded the file, edited it, tested it and then tried to upload it to the textadventures.co.uk, but couldn't do that.
I've tried edit->Upload a new file and I've tried uploading as a new game. Neither worked.
It updates the site for a couple of minutes and then says in a little part of the page that the connection with the site was lost.
The file size is 124 MB, I edited the library's templates.
I've tried uploading with Opera and Firefox.
The name of the file is "Ancaria Stories.quest" if that matters. Did I do something wrong?

As a test, are you able to upload a smaller file? If so, that would be an indication it's related to file size. I believe I have uploaded files roughly have the size you mention, but I would hope the site would handle gracefully files even as large as yours. I'm not sure if the problem would lie with the website or with something more local, like your internet provider.

Yep, I did something wrong, though not sure what.
It was filesize related, I basically re-did my work in Quest and the size dropped from mbs to kbs and it got easily uploaded.
Thanks for the reply!
It was either the incorrect messing with libraries or that the online version's filesize is huge when you download it to edit.