Please check the resolution of your video camera before recording the video. The video resolution should be between 720p and 1080p. Please do not send in 4K videos! It is the quality of the sound, not the picture, that is important.
iphone:
https://support.apple.com/en-gb/HT209431
samsung
Huawei
https://consumer.huawei.com/my/support/content/en-gb00415415/
tips_tax