Some days ago I started to post videos on DTube because I joined a challenge called "30 Day Speaking Chellenge" to improve my speakings skills in English and Portugues - I am a Spanish Native Speaker-, but since yesterday I have been trying to post the videos of the the day two of challenge and the plataform does not allow it.
It says: Por favor añade una imagen snap (Please add an snap image)
(Video speaking in English)
I added the snap, but the problem keep unsolved.
I have even tried to upload the videos some times. 
Please help me to solve this.
In advance thank you for your help.