OptionalmimetypeOptionalsizeOptionalthumbnail_Information on the encrypted thumbnail file, as specified in End-to-end encryption. Only present if the thumbnail is encrypted.
Optionalthumbnail_Metadata about the image referred to in thumbnail_url.
Optionalthumbnail_The URL to the thumbnail of the file. Only present if the thumbnail is unencrypted.
Information on media attachments of msgtype
m.fileUsed within
m.room.messageevents that reference files.See
https://spec.matrix.org/v1.11/client-server-api/#mfile