Discord rejects uploads that exceed the limit for your plan. Free accounts have a smaller cap than Nitro, so a video that works in one server may fail in another.
The quickest fix is to compress the file before uploading. Short clips can be re-encoded at a lower resolution or bitrate, and images can be resized without much visible loss. Archive files are usually better split into smaller parts than re-compressed.
If you need the original quality, upload it to a file host and share the link instead of the attachment. That also avoids filling the server's storage and keeps the channel history lighter.
Check the upload limit shown in the composer before retrying. If the file is only slightly too large, trimming a few seconds from a video or removing unused audio is often enough.
Quick tips
- Compress video to 720p for chat sharing.
- Resize images to the display size you actually need.
- Use a link for large archives or lossless files.
