Add non-image files to comments

[t-schroeder]

It would be nice if you could not only add embedded images, but also other types of files as attachments to comments.

I'm wondering if it would be better to:

1. have a separate file upload area for attachments underneath the regular text editor (collapsible and by default collapsed?) or
2. have to add attachments through the text editor itself and then link to them in the comment (e.g. in Atto first click the "Manage files" button, then upload the attachment there, then click the "Link" button, then "Repositories", then "Embedded files", then the previously uploaded file).