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You can contribute only Open Educational Resources
(Copyrighted material cannot be contributed)

- Preferred formats:
Audios – MP3, WAV, AAC
Videos – MP4, MOV, AVI, WMV, OGG (Preferably in 16:9 ratio)
Images – PNG, JPEG, JPG, SVG, GIF 
(Note: In case of PNG, JPEG and JPG the image should have a resolution greater than 5 Megapixels; Image size should be less than 20 MB)
Documents –  PDF, Epub, HTML
Interactive objects – GGB, H5P, HTML, JSMOL

-  All files get uploaded under the CC-BY-SA licence (This license lets others remix, tweak, and build upon your work even for commercial purposes, as long as they credit you and license their new creations under the identical terms) unless you chose a different licence

- Please visit https://creativecommons.org/licenses/ and http://www.gnu.org/licenses/fdl-1.3.en.html to learn more about licenses