Discord error 50045: File uploaded exceeds the maximum size

An attachment in your message is larger than the upload limit that applies to the destination. For bots the baseline is 10 MiB per upload; servers boosted to higher tiers raise it for that server, and Nitro raises it for users but not for bots. Unlike 40005, which is the transport-level "request too large", 50045 is Discord's own check after it has parsed the multipart body and looked at each file.

This also covers image fields that are not message attachments. Custom emoji images have a much smaller cap (256 KB), and avatars, banners, stickers and role icons each have their own. Sending a 2 MB PNG as an emoji yields 50045 even though it is well under the attachment limit.

{
  "message": "File uploaded exceeds the maximum size",
  "code": 50045
}

Implement a size gate with per-destination limits (message attachment vs emoji vs avatar) in your upload helper, and reject or shrink before calling Discord. Default to the non-boosted limit unless you have confirmed the server's tier.

Every media field has its own ceiling, and the attachment limit is just the largest of them. The full table, message attachments, emoji, stickers, avatars, is on the Discord limits page; a file that is small enough but undecodable fails with 50046 instead, so size and validity checks belong together in the upload path.