YESSSSSSS
it can’t. contents is a countable noun, hence ‘table of contents’ (describing a list of content). in this use case, there is one piece of content.
no, there are multiple contents (words, images, links) that you can enter in the post box
imagine the post box was the table of contents and the words and elements are the contents
the post box isn’t a table of contents? it’s a single idea or subject matter, thus is one piece of content (such as the content of a speech). it’s not hard to understand.
im talking about the contents of the post (what is inside) not what it is