Before uploading, don't forget to check the name of your picture. Some characters won't be read by the servers and therefore they won't be able to display your picture in the manager, resulting in a broken link.
Here is a list of characters to avoid :
- Any character with an accent: "é", "è", "ê", "ë", "à", …
- Apostrophes, commas, dots, colons, semi-colons, slashes, brackets, curly brackets, aswell as spaces.
- Any special character.