For TikTok video/audio issues, ensure that you have a good internet connection and the app is current. If TikTok appears unavailable or isn't letting you perform certain tasks, this is usually the culprit. Sometimes TikTok will play your audio through the editing process then when you post, there isn't any audio. More often than not it's because your TikTok app is outdated. Head over to the Google Play Store or App Store to check for updates.