The reason why I asked for the file is there are chances the the website changes your file after you submitted it. I want the original file so that I know what has been modified.

I know that the website always (slightly!) modifies my original HTML files. That was already the case before communities existed, BUT these small changes don't affect the appearance of the posts!
Therefore, if you check the source of my post, even if it differs from the original file, it is still alright.
However, when I want to edit this post, THEN the editor completely changes the code again in a way which changes the appearance of the post.

And even if the editor was not created to handle pure HTML, I never experienced that behavior before, even if I already wrote many hundred posts.

Sorry for this long explanation, but it is important for me that you can understand what I wanted to say. I tried my best to explain it, even if English is not my mother tongue.

I don't have the original file anymore, but I could create it again with help of the source of the post, because both are very similar.

I understand your point of using GitHub, but I hope you understand mine too: I may try to find out how to use it, but I am sure that the majority of users won't. That's why I think it would be great to have a place directly on this blockchain to spot and discuss errors.

I also understand that you don't have enough time to care about every request of so many users, but on the other side everybody, especially witnesses and developers profit most from a thriving STEEM blockchain based on a growing and satisfied user base. That's why I mentioned this problem here (and spent quite some of my precious time for pointing it out, as well). :)
According to the other comments I am not alone.

Anyway, in case I find enough time I may check how to use GitHub and open an issue there, but I hope that even if you cannot help me (again: I understand your lack of time) you may think about what I wrote: 99 % of all users never used GitHub (and won't do in future).

Have a nice day! :)