Why won't my video upload? A troubleshooting checklist
Read the exact error first. Compare the original file with the upload requirements for your account and composer, and check local playback and connectivity. Size, duration and format checks can narrow the cause; none proves that the file will upload.
Check these first
- File size against the platform limit
- Duration against the platform limit
- File extension and, if you can check it, the codec inside it
- Whether the file opens and plays normally on your own device first
Likely causes
- File is over the size limit
Compare the exact file size with the limit for your account and upload surface: the platform's published cap. A failed upload alone does not identify its cause.
- Video is longer than allowed
Reference duration: the platform's published maximum. Confirm that this applies to your account and composer before trimming a copy.
- the file's container may not match the upload requirements
Check the documented formats for the exact upload surface. A filename alone does not prove the internal container or the cause of rejection. A MP4 export is a fallback to test, not a guarantee.
- The export itself is incomplete or corrupted
An interrupted export, a killed app, or a file copied while still writing can look fine in a file browser but fail to open or upload anywhere. Re-export from the original source rather than re-trying the same file.
Fix it
- Compress it
Try a smaller output preset on a copy, then check the generated size and quality. Re-encoding can lose detail and does not guarantee a smaller file or platform acceptance. This tool accepts files up to 100 MB. For a larger source, export a smaller copy in your local editor first.
Compress a video - Convert it to MP4
This browser converter accepts files up to 100 MB, re-encodes them and can lose quality. Convert a copy from the original and preview the generated video and audio before uploading it yourself.
Convert to MP4 - Re-export from the original source
Rather than repairing a suspect file, export a fresh copy from the camera roll or editor and try that instead.
Check your file
Extension and MIME type are labels, not proof of the container. Dimensions and duration come from this browser's media reader. This does not detect codecs, bitrate, corruption or platform upload compatibility. Files and measurements are not sent anywhere.
Prepare a copy in Koldflux, review its output and check the current destination requirements before publishing.
Automate this in Koldflux