What is/are the most appropriate file upload website/s to upload and paste the link into the question?
There's no established site for hosting content that can't be hosted on SO itself. The main thing that matters from the point of a StackOverflow question is long-term validity, so try to put it somewhere that's stable enough that the page can stay there undisturbed for a long time. If your question relies on some resource that's too large to post on SO, put it somewhere else and provide a link to it.
Don't expect folks here to dig through a huge volume of HTML to debug your problem. If you think the problem is with some specific part of the file, it's up to you to do the work to narrow the problem down to something that you can reasonably post.
On the other hand, if the problem seems to be related merely to the size of the file and not to any specific code, I think that's a reasonable thing to ask about. In other words, if you can create a file that's filled with something inconsequential, like
<p>Hello world!</p> repeated as many times as necessary to bulk up the file to the point where the problem occurs, then you have a reasonable question. (You also have a reasonable bug report, and should consider addressing the problem to the publisher of the browser rather than to SO.)
For example, a question like this should be okay:
Is there a standard HTML file size limitation?
I noticed that my browser fails to load files like this one
http://link/to/some/big/file), but works with files that are similar and only
slightly smaller, like this one (
Have I discovered a problem with my browser, or is there some commonly
agreed upon limit to HTML file?
On the other hand, it would be poor form to ask something like this:
What's wrong with my HTML?
I've got an enormous HTML file here
http://link/to/some/buggy/html/file) and I've been trying to debug
it for a week but I'm just really at a loss for what the problem could
be. Could someone maybe take a look and find the problem for me?