(if you're using apache), check that the LimitRequestBody directive isn't
set too low (it's optional, so it may not be there at all).
+process_links: follow redirects and save all available file information
+ (mimetype, date, size, oembed, etc.). Defaults to true.
file_quota: maximum size for a single file upload in bytes. A user can send
any amount of notices with attachments as long as each attachment
is smaller than file_quota.
sslpath: if this and the sslserver are specified, this path will be used
when creating HTTPS URLs. Otherwise, the attachments|path value
will be used.
+show_thumbs: show thumbnails in notice lists for uploaded images, and photos
+ and videos linked remotely that provide oEmbed info. Defaults to true.
+show_html: show (filtered) text/html attachments (and oEmbed HTML etc.).
+ Doesn't affect AJAX calls. Defaults to false.
+filename_base: for new files, choose one: 'upload', 'hash'. Defaults to hash.
group
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