feat: Attachment of files as block to documents using s3

[warnus]

I added file upload feature. (outline commit is https://github.com/outline/outline/pull/2936)

It is almost same with what chanchadsahi, FeralMib did(#280 , #603 ).

The difference is that it is made form of a notice block.

And, I need some help. There are bad code here.

parseMarkdown() { return { block: "container_file", getAttrs: token => { const file_regex = /\[(?<alt>[^]*?)\]\((?<filename>[^]*?)\)/g; const result = file_regex.exec(token.info); return { src: result? result[2] : null, alt: result? result[1] : null, }; }, }; }

I want to place src(file url) and title variable in attributes but, I don't know how to do it.

Can anyone help this?