upload_comment_attachment

Every item needs all three of file, filename and type. An item missing any of them is dropped before anything is uploaded, and a call left with no items is refused.

Only PNG, JPEG and WEBP are accepted, up to 30 MB each, and a comment holds at most 5 attachments in total. A call that would take the comment past that total is refused as a whole. A file that is too large or the wrong type is dropped silently rather than failing the call, so compare the returned list against what you sent.

Every uploaded image gets a world-readable public URL, and the tool tells the client never to attach anything private. The Comments panel does not show attached images and people viewing the site through its shared link never see them, but list_comment_attachments reads them back. See Comments.

Inputs

Input	Type	Required	Description
commentId	string	Yes	The comment or reply to attach them to.
files	array of objects	Yes	The images to attach, at most 5 items. Each item needs all three of file (the image as a base64 data URL, such as data:image/png;base64,...), filename (such as screenshot.png) and type (the MIME type, image/png, image/jpeg or image/webp), or it is dropped.