Is this an error or is Gelbooru blocking the uploaded files?

gelbooru.com/index.php?page=post&s=view&id=9155245

The image is 404. We still don't know what causes this.

So, there is no issue if I try to upload it again?

If it has the same MD5 hash our duplicate detector will keep you from uploading it.

There is a way to avoid this issue?

I believe you can just re-save the png without any loss of quality.

thanks

Link doesn't work, I'm getting 302 Found and redirect to forum's index

Also, on semi-unrelated note, webms vp9 are no-go? I'm getting "Filetype not allowed. The admin is accepting complaints regarding this right now."
EDIT: since I've made post already and search is still borked: AV1 mp4s are off-limits as well?

Thank you for this! Really appreciate all the help and the links!

I have a handful of talking points.

First and most important to me:
Several months ago, I spent a frankly embarrassingly long time porting my rather large list of most commonly used tags on another site, including 'translating' certain tags that have a different name here.
Maybe a few weeks later, I was pretty devastated to find that my tag list was completely gone. Additionally, the "Display all site content" seems to keep unchecking itself periodically.
One possible caveat is that I exclusively browse in Private/Incognito mode, but I did a quick test recently and my Tag List & Display toggle persisted even after closing everything and logging in again.
I would appreciate any insight into this, as it is both frustrating and annoying.

Looking at the wiki page for tag group: breast tags (gelbooru.com/index.php?pa...s=&s=view&id=8314), there are a number of different styles among links on the page.
There are the default/unstyled links, but there are also links in bold, in italics, and with an asterisk (*) at the front. What is the significance of this?

On a similar note, regarding the subject of 'size' notation; is there a specific reason why the [[huge_breasts]] tag doesn't also Imply the [[large_breasts]] tag? I am not even saying that I necessarily dislike GB's system. In contrast, on e621 the breast size order goes [breasts] -> [big_breasts] -> [huge_breasts] -> [hyper_breasts], with each progressive step Implying all previous tags.
This makes it an "At Least" system of categorization rather than an "Exact" one. (The [flat_chest] and [small_breasts] tags are naturally excluded from this hierarchy.)
I find their system to be at least slightly superior (especially in flexibility), mainly for the reason that when performing a search, it is much simpler to add a negative search term than to fight against ungainly OR groupings.

Lurker no more! =D