Not letting me upload a file bigger than 2000KB to anywhere... posts or an Album (only just found how to make one).
To confirm this is in the media gallery part of the forums not directly in a post. First thing I checked after the forum settings.
No doge biscuit? bloody PHP configs... Because the config options in the 3 places nginx expects or 4 places in the forums totally isn't enough.
Album Upload/Media: This is a positive problem. Was able to upload 1 picture but nothing else. 100kb to 2Mb doesn't matter. Error message "Can't upload" or "Too big". Deleted that picture and unable to upload it again nor any other picture.
This is likely due to the age and post count of your account. Once you have made a few more posts this should open up to you.