Help please to understand the reason of deviation of the project.

Help please to understand the reason of deviation of the project:
“Please make sure you are using a codec such as h.264 or Photo-JPG, which will play across multiple formats.”
What means it?
At me and at my friends all is reproduced properly. Created the previous works as well as this and questions did not arise.

As long as the items your submitting meet the requirements found in this article, you should be ok. Any other codecs or formats are not accepted.

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Thank you is big, I have already understood that they wanted from me.)